Why is protein important after exercise?

Answer: Repairs and builds muscles

Repairs and builds muscles ✓ — Exercise stresses muscle fibers, and the body repairs and remodels them afterward. Protein supplies amino acids for that repair, so getting enough protein across the day helps muscles recover and adapt to training.

Provides instant energy — Carbohydrates are the main quick fuel for exercise, because they are stored and broken down more readily for energy. Protein can be used for energy in a pinch, but its more useful job here is providing material for repair.

Cools body temperature — Sweating and blood flow handle most body-temperature control during and after exercise. Protein does not cool you down; it supports the rebuilding process that follows the workout.