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If you lift heavy enough you get micro tears (muscle soreness).
While you are exercising your muscles burn food to make ATP which allows your neurons to tell your muscles when to contract. The byproducts of this metabolizing of food molecules makes it harder for your muscles to keep contracting. Lactic acid (a byproduct) builds up and burns.. Well, its a vague answer for a vague quesiton :P
What else can I help you with?
What kind of acid is produced by our muscles during exercise?
Lactic acid is produced by our muscles during exercise.
What muscles are worked during a dumbbell raise exercise?
During a dumbbell raise exercise, the muscles primarily worked are the deltoid muscles in the shoulders.
What muscles are worked during a lateral raise exercise?
During a lateral raise exercise, the muscles primarily worked are the deltoid muscles in the shoulders.
What muscles are primarily targeted during a lat raise exercise?
The primary muscles targeted during a lat raise exercise are the deltoid muscles in the shoulders.
What muscles are used during a squat exercise?
The main muscles used during a squat exercise are the quadriceps, hamstrings, glutes, and lower back muscles.
What muscles are worked during a deltoid raise exercise?
During a deltoid raise exercise, the muscles primarily worked are the deltoid muscles, which are located in the shoulders.
What are the primary muscles used during a squat exercise?
The primary muscles used during a squat exercise are the quadriceps, hamstrings, glutes, and lower back muscles.
What muscles are worked during a reverse hyper exercise?
During a reverse hyper exercise, the muscles primarily worked are the glutes (buttocks) and the lower back muscles.
Which muscles are primarily engaged during the bridge exercise?
The muscles primarily engaged during the bridge exercise are the glutes (buttocks), hamstrings, and lower back muscles.
What are the primary muscles activated during a front lever exercise?
The primary muscles activated during a front lever exercise are the latissimus dorsi, core muscles, and the muscles in the arms and shoulders.
What muscles are primarily targeted during skull crushers exercise?
The triceps muscles are primarily targeted during skull crushers exercise.
During high intensity exercise, where do muscles primarily get their energy from?
During high intensity exercise, muscles primarily get their energy from stored glycogen in the muscles and glucose in the bloodstream.
