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Cold Plunges Probably Aren't Doing What You Think

  The cold plunge became the ultimate biohacker flex. The research paints a much more complicated picture — and for lifters, it might actually be counterproductive. Cold water immersion went from a niche recovery tool used by elite athletes to a mainstream wellness trend seemingly overnight. Social media is full of people climbing into ice baths at dawn, filming their gasping reactions, and claiming benefits ranging from reduced inflammation to improved focus to accelerated fat loss. Cold plunge tubs are now a multi-billion dollar market. It made ACSM's trending fitness list in 2025. The appeal is understandable. There's something viscerally satisfying about doing something uncomfortable and believing it makes you better. And cold exposure does have real physiological effects — it triggers a norepinephrine release, vasoconstriction, and an acute stress response that genuinely makes you feel alert and energized. But "it makes you feel good" and "it improves your t...
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Why Am I Gaining Weight After I Started Working Out?

 You started exercising, cleaned up your diet, and you're putting in the work — so why does the scale say you've gained weight? Before you panic, here's what's actually happening.

It's one of the most frustrating and confusing experiences a new exerciser can have. You commit to a fitness routine, you show up consistently, and then you step on the scale a few weeks in and the number has gone up. For many people this is the moment they quit — convinced that exercise isn't working for them.

But in most cases weight gain after starting a workout program isn't a sign that something is wrong. It's often a sign that your body is doing exactly what it should. Here's the science behind what's really going on.

Photo by Joachim Schnürle on Unsplash

Reason 1: Water Retention From Muscle Repair

This is the most common cause and the one most people have never heard of.

When you start a new exercise program — especially one involving resistance training — you're creating microscopic damage to your muscle fibers. This is a completely normal and necessary part of the adaptation process. Your body responds to this damage by sending fluid to the affected muscles to begin the repair process.

This inflammatory response causes your muscles to retain water temporarily — and water is heavy. A liter of water weighs approximately 2.2 pounds. If you've started a full body training program and several muscle groups are simultaneously in repair mode, the water retention can add anywhere from 2 to 5 pounds to the scale in the first few weeks.

This weight is not fat. It's not permanent. It's your body adapting to a new stimulus — and it's actually a sign that your training is working.

Reason 2: Muscle Glycogen Storage Increases

When you begin exercising regularly your muscles become more efficient at storing glycogen — the carbohydrate fuel they use during exercise. For every gram of glycogen stored your body also stores approximately 3 grams of water alongside it.

As your muscles build their glycogen capacity in response to your new training routine your body holds more water as a result. Again this is weight on the scale — but it's not fat and it's actually a performance enhancing adaptation.

Reason 3: You're Building Muscle While Losing Fat

Here's the scenario that sounds impossible but isn't — especially for beginners. When someone new to exercise starts training and eating more protein they can simultaneously lose fat and gain muscle. Since muscle is denser than fat the scale can stay the same or even go up while your body composition is actually improving dramatically.

This phenomenon — sometimes called body recomposition — is most pronounced in beginners, people returning after a break, and people with higher body fat percentages. The scale tells you nothing about the ratio of muscle to fat in your body. Two people can weigh exactly the same and look completely different depending on their body composition.

This is why the scale is one of the least reliable indicators of fitness progress — particularly in the first few months of a new program.

Reason 4: Increased Appetite Leading to More Food Intake

Exercise increases appetite — this is well documented. Research published in the American Journal of Clinical Nutritionfound that many people unconsciously increase their food intake when they begin an exercise program, often consuming more calories than the workout burned.

This isn't weakness or failure — it's a hormonal response. Ghrelin, your hunger hormone, often rises with increased physical activity. If you're eating more without realizing it, weight gain is a straightforward outcome.

This is particularly common when people reward themselves for exercising — a post workout smoothie, a slightly larger portion at dinner, or an extra snack — none of which feel significant but can collectively offset or exceed the calorie deficit exercise creates.

Reason 5: Hormonal Shifts and Cortisol

Starting a new exercise program is a form of physical stress on the body. In response your adrenal glands produce more cortisol — your primary stress hormone. Elevated cortisol can cause temporary water retention, increase appetite, and in some cases slow the rate at which your body burns fat.

This effect is typically short lived. As your body adapts to your new training routine over several weeks cortisol levels normalize and the temporary retention resolves.

How to Tell If It's Normal Weight Gain or Actual Fat Gain

Ask yourself these questions:

  • Are your clothes fitting differently — perhaps looser in some areas even if the scale is up? That suggests body recomposition.
  • Did the weight increase suddenly in the first 1-3 weeks? Likely water retention from muscle repair.
  • Are you eating significantly more than before? Worth tracking honestly for a week.
  • Do you feel stronger, have more energy, or notice physical changes in the mirror? These are the real indicators of progress.

What to Track Instead of the Scale

The scale is one data point — and a misleading one in the early weeks of a fitness program. Better metrics include:

  • Body measurements — waist, hips, chest, arms, thighs measured weekly
  • Progress photos — taken in the same lighting and position every two weeks
  • Performance metrics — how much weight you're lifting, how far you can run, how many reps you can complete
  • How your clothes fit — often the most honest indicator of body composition change
  • Energy levels and sleep quality — both improve with consistent training


If you're serious about tracking real progress beyond just the number on the scale the RENPHO Smart Scale is a game changer. It measures 13 body metrics including body fat percentage, muscle mass, and water weight — giving you the full picture of what's actually changing in your body. Syncs directly to your phone via Bluetooth and is one of the best value smart scales on the market.

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When Should You Actually Be Concerned?

If you've been training consistently for more than 8-12 weeks, your diet is genuinely in check, and the scale is still climbing — it's worth reviewing your nutrition more carefully. At that point the initial water retention and glycogen storage adaptations should have stabilized and persistent weight gain is more likely related to calorie intake.

But in the first month or two — give your body the time it needs to adapt without letting the scale derail your progress.

The Takeaway

The scale going up after you start working out is almost always temporary, normal, and in many cases a sign that your body is adapting positively to exercise. Water retention, glycogen storage, and muscle building are all common early responses to a new training program — and none of them are fat gain.

Put the scale away for the first six weeks. Take progress photos instead. Trust the process.

If you have concerns about unexpected weight changes consult your healthcare provider.

Sources:

  • Stiegler, P. & Cunliffe, A. (2006). The Role of Diet and Exercise for the Maintenance of Fat-Free Mass. Sports Medicine.
  • Kreider, R.B. et al. (2010). Exercise and Sport Nutrition. Journal of the International Society of Sports Nutrition.
  • King, N.A. et al. (2008). Dual-process action of exercise on appetite. American Journal of Clinical Nutrition.
This post may contain affiliate links. If you purchase through these links Pulse & Proof may earn a small commission at no extra cost to you. We only recommend products we genuinely believe in and that align with our commitment to science-backed health and fitness advice. Thank you for supporting Pulse & Proof.
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