Question

why we feel tired after exercise​

Answer 1

Why You're So Tired After a Workout



Exercise is supposed to make you feel energized — not exhausted. But if you're feeling lethargic after your workout, you're not alone. When you exercise, you burn calories and expend energy. Depending on the length and intensity of your workout, you may be physically taxing your body, which means you need water, nutrients and rest to recover. Here are some reasons you might feel especially tired after a workout and what you can do about it.



Causes of Tiredness After a Workout

Many different factors can contribute to that sluggish feeling you're experiencing after working out. Some of the most common culprits include:

1. You're Pushing Yourself Too Hard

While it may sound obvious, the more intense your fitness routine is, the more tiredness after exercise you'll typically feel afterward. This is because of the way your body meets its energy needs during exercise.

During low- to moderate-level exercise, the body harnesses energy from a molecule called adenosine triphosphate, or ATP, which uses oxygen in the body to keep you moving. Staying at this intensity level allows you to work out while also effectively recovering afterward.

When your regimen is too strenuous, however, the demand for ATP is higher, and it can leave your energy reserves depleted and may leave you with extreme fatigue after working out.

Answer 2

lactic acid is what cause muscle to burn after streeneous exercise...ATP is the energy source that muscle fibre make muscles contract. some of the reaction are converting glycogen to ATP take place without oxygen, and when these hapen a compound called pyruvate is produced..