When Your Body Gives You Evidence

Something that once left you breathing hard no longer does. You can walk farther, lift something that used to feel heavy, stay in the game longer or finally perform a movement that once seemed determined not to cooperate. Your muscles, heart and lungs have adapted because you repeatedly asked them to do the work. But another change has happened that no fitness test measures very well.

That matters because health-related fitness is not only about what happens inside muscles, bones, your heart or your brain. You also experience those changes. You notice that the hill is easier, your legs are stronger or you do not tire as quickly. Your body has changed, and your brain gets to notice the result. That is where fitness starts connecting with energy, self-confidence, self-esteem and body image.

How does exercise give you more energy if it uses energy?

People often say regular activity gives them more energy. This sounds suspicious because running, swimming, cycling and climbing stairs quite clearly use energy. The explanation is not that exercise installs an extra battery somewhere behind your liver.

As your cardiorespiratory and muscular fitness improve, the same physical task uses less of what you are capable of doing. Suppose climbing three flights of stairs once required almost everything your legs, heart and lungs wanted to contribute. After becoming fitter, those same stairs require a smaller portion of your total capacity. The stairs have not become easier. You have become more capable of handling them.

That difference can reach far beyond exercise. Walking somewhere, carrying things, playing with friends or spending an active day can take less out of you. Better sleep, which we explored in the previous post, also supports recovery and how you feel the next day. “More energy” is therefore not magic energy appearing from nowhere. It is partly having more capacity for what your day asks you to do.

Confidence has a favourite kind of evidence

Suppose you choose an activity, make time for it and actually do it. You return to it often enough that something changes. You last longer, become stronger, learn a skill or simply find the activity easier than it used to be. You have just created what psychologists call a mastery experience: succeeding at something through your own effort and experience.

Mastery experiences are powerful builders of self-efficacy, which means believing you are capable of doing a particular thing. Instead of somebody saying, “You can do it!”, your brain has something more convincing.

That helps explain the connection between physical activity and self-confidence. Confidence does not require being the best person in the gym, on the field or anywhere else. Someone else might run faster, lift more or possess the slightly alarming ability to fold themselves into what appears to be carry-on luggage. Their ability does not cancel yours. The useful question is often much simpler:

Self-esteem is bigger than being good at something

Self-esteem is different from self-confidence. Confidence can be specific: I think I can handle this. Self-esteem is broader and involves how you value and regard yourself. Relationships, family, experiences, culture, successes, difficulties and many other parts of life influence it.

Research shows that physical activity improves self-esteem in children and adolescents, but that does not mean getting fitter automatically makes someone feel great about themselves. Activity creates opportunities for things that support self-esteem: competence, progress, accomplishment, connection and belonging. You can experience yourself learning, persisting and improving. There is no special self-esteem chemical released by your hamstrings after your third squat.

This is especially important when the activity is something you chose rather than something you are simply forced to complete. You decide to do it, make room for it, follow through and eventually experience the result. The physical change belongs to you, but so does the accomplishment.

Your body is more than something to look at

Body image is how you perceive, think about and feel about your body. Appearance can become a very loud part of that, especially when bodies are constantly photographed, compared and commented upon. Physical activity does not automatically create positive body image, and exercise environments focused heavily on weight, shape or comparison can actually make body image worse.

But activity gives you another source of information about your body: what it can do. Legs become what carry you up a hill, propel a bike, stabilize a landing or help you stand back up. Arms lift, throw, pull, balance and support. Your heart and lungs become something you can experience improving when an activity that once exhausted you becomes manageable.

Strength, endurance, balance, coordination, skill and progress can now join the picture. A mirror can show you what your body looks like from one angle at one moment. It cannot show you that you climbed farther, recovered faster, learned to skate, became stronger or finally made it to the top of that hill without negotiating a peace treaty with your legs.

Then fitness becomes something you own

There is a big difference between someone telling you to exercise and discovering that your own choices changed what your body became capable of doing. You chose something. You found a place for it in your week. You followed through often enough to notice a change.

That builds more than fitness. Each time you successfully plan and complete an activity, you gain experience making physical activity happen in your real life. Eventually the decision can become increasingly self-initiated and self-directed rather than something that happens only because a teacher, coach or parent arranged it.

Of course, real life interferes. Homework appears, plans change, weather happens, you get tired, and occasionally a sofa develops an unusually powerful gravitational field. Missing what you planned does not erase the capability you have built. Health agency includes learning how to adjust and return, not being perfect.

Health-related fitness therefore gives you something much more useful than a score. Your strength, endurance and flexibility describe parts of what your body can do now, not permanent limits on what it can become. Repeated activity gives your body reasons to adapt, while experiencing those adaptations gives you evidence about yourself.