Just a few days into the new year is a good time to look back at the New Year's resolution, for health, diet and fitness! A 75-ditness challenge may not be the first thing that comes to your mind. However, this has gained a massive traction on TikTok. It is called the "75 Hard" challenge, where participants also document their progress. The challenge includes strict rules to comply with. These include: adhering to a healthy diet with no cheat meals or alcohol, completing two 45-minute workouts daily (one outdoors), drinking over three liters of water, and reading 10 pages of a non-fiction book each day.

While this might seem like a straightforward regime, experts suggest that for some, a more relaxed version may help them better.

What the participants feel?

As reported in BBC, Devamsha Gunput, 29, who successfully completed the 75 Hard challenge while juggling a full-time job as a digital consultant in Edinburgh described it as a "tough but transformative journey". One of the biggest challenges she faced was setting boundaries with her South Asian family to maintain her strict diet.

Living in Edinburgh’s dark, wet, and cold weather made outdoor workouts particularly difficult. Despite these hurdles, Devamsha noticed lasting benefits, including more consistent exercise habits, improved reading routines, and a better relationship with food.

The origin of this challenge

The challenge was originally created in 2019 by author and podcaster Andy Frisella to foster mental toughness. While not a certified personal trainer or doctor, Frisella designed the program based on his personal experiences, emphasizing discipline rather than weight loss or specific physical outcomes.

Initial challenges

For Sophie Deakins, 27, who completed the challenge while managing a cinema in London, 75 Hard was a way to address her struggles with consistency and discipline. She eliminated sweets, opting instead for natural sugars from fruit and honey, and tracked her diet and water intake meticulously.

Sophie found the first few weeks challenging as she adjusted to new habits, particularly when socializing, as it often revolved around dining out and drinking. By being open about her goals, she was able to navigate these situations without succumbing to temptation.

Post-challenge, Sophie continued some habits, like avoiding unnecessary coffee shop purchases and limiting eating out, which not only improved her health but also saved her money. Most importantly, she experienced a significant mindset shift, overcoming self-doubt and excuses about time.

Balancing the Pros and Cons

While many find 75 Hard rewarding, it’s not suitable for everyone. Strength and conditioning expert and gym coaches advise considering the significant time commitment required for the workouts, reading, and other tasks. They suggest adopting simpler elements like daily movement and drinking more water without feeling overwhelmed.

Motivation is another concern. The pressure to transform one’s life at the start of the year can be counterproductive. Experts recommend setting achievable goals that add joy and value to daily life rather than creating stress.

What does not work out?

The 75 Hard challenge has not been clinically studied, nor has it been made after considering an average person's ability to cope with such changes so quickly. It is personally designed by Frisella, whose strength may not match others. This is what is making its long-term benefits unclear. Healthcare providers, doctors, and other experts point out that a more basic routine, such as regular exercise and a balanced diet, might achieve similar results without the extreme demands.

Ultimately, while 75 Hard can help build discipline and mental toughness, it’s essential to tailor health and fitness goals to your needs. For reliable guidance, the NHS Live Well website offers comprehensive advice on diet, exercise, and mental well-being.

Most people walk into a gym assuming more effort always means more progress. It doesn't. Push past a certain point, and your body stops adapting and starts breaking down instead. Here's how to tell the difference.

Your Urine Turns Dark

If your urine looks like tea or cola after a hard session, that's not dehydration, and it's not something to shrug off. It's often the first visible sign of rhabdomyolysis, a condition where damaged muscle fibres leak their contents into your bloodstream. Doctors have seen this happen even in people doing fairly ordinary workouts.

In one case documented in Case Reports in Emergency Medicine, a healthy 23-year-old woman ended up in hospital after nothing more than a high-rep upper-body session, no underlying condition, no history of it happening before. A wider 2024 review in Apunts Sports Medicine found the same warning sign showing up again and again across dozens of similar cases. Left alone, it can damage your kidneys.

You're Always Catching Something

If you feel like you're sick every few weeks, the gym might be the reason. Long, intense workouts can leave your immune system weaker for a stretch afterward, not stronger. Research in Immunology and Cell Biology traced this to lower activity in several of the body's key infection-fighting cells. And this isn't rare.

According to sports physiologist Roy Stevenson's website, roy-stevenson.com, roughly two out of three elite runners say they've gone through it at some point, and the numbers look similar for swimmers, cyclists and bodybuilders.

You Can't Sleep, Even Though You're Exhausted

This one trips people up because it feels backwards. You'd expect exhaustion to mean better sleep, not worse. But a case documented in Sports Psychiatry showed the opposite.

An athlete's sleep fell apart as training piled up, and it only recovered once the training load came down. It's a pattern researchers see often enough that poor sleep, alongside anxiety and low mood, is now considered one of the clearer signals that someone is overtraining.

Your Numbers Keep Dropping

Lifting less, running slower, gassing out earlier, even though you're showing up consistently, does not mean things have reached a standstill. It means they're going backwards. Athletes often assume the fix is to push harder. 'That may end up making the problem even worse,' says Dr. Caitlin Lewis, a sports medicine physician, according to Cleveland Clinic's health website.

Once performance keeps sliding despite steady effort, that's usually the body flagging that it hasn't recovered from the last session.

You're Irritable or Low, and You Don't Know Why

Nobody thinks to blame the gym for a short temper. But hard training raises cortisol and disrupts the hormones that keep your mood steady.

Physician Gabe Mirkin has pointed to research out of Austria that found restlessness and irritability often show up before performance even starts to drop, which makes them one of the earliest clues, if you know to look for them.

Old Injuries Won't Stay Gone

One injury can happen to anyone. But when the same one keeps coming back, or new ones keep appearing, it usually means your body isn't getting the recovery time it needs between sessions.

A 2024 review in the Journal of Clinical and Diagnostic Research pointed to exactly this. Overuse and poor recovery, not bad form or bad luck, as the biggest drivers of gym injuries.

None of this means training hard is the problem. It means recovery isn't optional. Skip it long enough, and the gym stops building you up and starts wearing you down.

Physical fitness isn’t the only reason why astronauts exercise in space. Their daily workouts are a medical necessity meant to protect the heart, muscles and bones from the effects of microgravity.

New research based on 13 astronauts suggests that this strategy may be working.

Echocardiograms taken during six-month missions showed that the astronauts experienced mild changes in heart structure and function after entering microgravity, but these changes stabilised during the mission and returned to normal after they came back to Earth. The findings were published in Circulation.

The results are particularly important as space agencies prepare for longer missions, including journeys to Mars.

What Does Zero Gravity Do To The Heart?

On Earth, gravity constantly pulls blood and other body fluids towards the lower half of the body. In microgravity, that pull largely remains absent.

As a result, fluids shift towards the chest and head. The cardiovascular system initially receives more blood than it is accustomed to handling, but over time the body adapts by reducing blood volume. The heart also does not have to work against Earth's gravitational shift in the same way.

NASA says this can reduce cardiovascular function and contribute to problems like low blood pressure and dizziness when astronauts return to Earth.

Longer missions can make these changes more concerning. NASA notes that cardiovascular deconditioning can begin within days of entering a low-gravity environment.

Also read: Obesity Should Not Be Defined Solely By BMI: AIIMS Director Explains Fat Distribution & Metabolic Health

Astronauts Exercise For Around 2 Hours A Day

Astronauts aboard the International Space Station use a treadmill, stationary bicycle and resistance-training equipment.

NASA says crew members currently average around two hours of exercise per day, while another NASA health-care overview schedules astronauts for about 2.5 hours of daily exercise, including time for preparation and recovery.

The goal is not simply to burn calories. Aerobic exercise helps maintain cardiovascular fitness, while resistance training provides mechanical loading that the body no longer receives naturally from Earth's gravity.

NASA describes exercise as a vital practice for maintaining astronaut health and performance in low to zero gravity.

Also read: Are Gaming Chairs Actually Bad For Your Back? Why Cushioning, Posture And Long Sitting Matter

What Did The New Study Find?

The researchers went beyond measuring astronauts' heart rate and blood pressure. The crew members were trained to perform their own echocardiograms, allowing researchers on Earth to remotely guide them through ultrasound imaging of the heart while they were in space.

The scans showed that the heart adapted to microgravity, but the changes did not continue worsening throughout the six-month missions. After returning to Earth, the astronauts' cardiac structure and function returned to their earlier state.

Benjamin Levine, NASA cardiologist, said the findings were “really reassuring” for future Mars missions. He noted that when astronauts were exposed to simulated Martian gravity, equal to three-eighths of Earth's gravity, none showed a cardiovascular response more stressed than standing upright on Earth before the mission.

Essential For Longer Space Missions

A Mars mission would be far longer than a typical six-month stay aboard the ISS.

A planned mission could involve roughly six months travelling to Mars, an extended stay followed by another six-month journey home.

The heart therefore cannot simply rely on the possibility of recovering after returning to Earth.

Levine said future spacecraft will need exercise equipment capable of preserving “the entire spectrum of human adaptation to physical activity”, including the heart, skeletal muscles, bones, and even mental health.

One of the myths about chairs is that the more cushion you have, the better the support. However, comfort and support are not the same thing. A soft feeling chair may allow the body to sink into a position that is not in proper alignment of the spine, pelvis, neck and shoulders.

Gaming chairs often come with plush padding, deep seats, high backrests, and reclining mechanisms. These features may make the chair cozy for long gaming sessions. But this comfort can be at the expense of posture if the chair does not have enough lumbar support or the person is sitting in a slumped posture. The problem isn’t necessarily that a gaming chair is soft. The bigger issue is how the chair supports the body and how long the person sits in the same position.

How Long Hours Of Sitting Can Strain The Spine

When person sit for hours on end, the muscles that support the spine are working non-stop to maintain the correct posture. A backward roll of the pelvis and rounding of the lower back can put additional strain on the muscles and structures that surround the spine.

This can lead to pain, stiffness and discomfort in the lower back over time. Sometimes a firm office chair can provide a more stable base and help maintain a neutral sitting position. This does not mean that a hard chair is healthier than all gaming chairs, but that the right firmness and support might be better than too much padding that allows the body to sink.

The position of the lower back is especially important. The chair should curve to fit the natural curve of the lower back. Feet should be comfortably on the floor and hips and knees should be in a comfortable position. A bad sitting posture can also affect the neck and shoulders. If the monitor is placed too low, the head will move forward and downward. This may result in a stiff neck, shoulder pain and headaches over the following several hours.

Also read: Physiotherapy Day – Are Hourly Breaks Enough To Minimise Risks From Prolonged Sitting: Doctors Warn Office Workers

Why An Expensive Gaming Chair Cannot Fix Long Sitting

Another myth is that buying an expensive gaming chair automatically solves the problem of long sitting. A chair’s appropriateness is not dependent on the amount of cushioning. The height of the chair should correspond to the height of the person, the proportions of the body, the arrangement of the desk, and the daily activity.

More importantly, no chair can make long, uninterrupted sitting healthy. Those who work or game for several hours should get up regularly, walk a few minutes, stretch and change their sitting position.

Persistent back pain, numbness, tingling, weakness or pain traveling into the legs should not be simply put down to the chair and may require medical assessment. So, the healthiest chair may not be the softest or most expensive one. It’s the chair that gives good support, allows natural movement and doesn’t leave one in one position for too long.

By Dr. Mohit Muttha, Consultant Spine Surgeon, Manipal Hospital Kharadi