Aheavyset middle-aged insurance salesman, who doesn't exercise often, accepts his friend's invitation to a pickup basketball game. when attempting a jump shot, he falls to the ground in pain, grasping at the calf of his leg. there is an enormous bulge in his leg immediately below the popliteal fossa, and he is unable to plantar flex that foot. most likely he has injured his and the bulge is

he has most likely injured his achilles tendon and the bulge is fluid.

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 )