Fatigue is temporary loss of strength and energy resulting from hard physical, or nervous exertion (stress).

Fatigue is temporary loss of strength and energy resulting from hard physical, mental, or nervous exertion (stress).

Explanation:

Fatigue is a temporary loss of strength and energy If we lose strength we have mainly done a hard physical activity, however, If we lose energy we have done a very demanding activity for our brain (mental activity), muscles, and nervous system. To not be fatigued anymore the body needs to regain energy and strength by resting and digesting nutrients.

to increase speed you need to decrease frictiona dn drag hense why sprinters wear tight track suits to keep tight against there skin to keep away from wind and decrease the amount of drag you are carrying.a swimmer will wear the tightest swim suit they can possibly fit into (i was a size 28 swim suit at meets i wore a   size 23) why? because the tighter your clothing is the less drag and negative force you have. the heavier the clothe the slower and more wind gets caught. cotton tends to hold onto alot of sweat and water making it slower then say a track suit (no idea what they are made of but they are really comfy around your answer )