7. Very few people have a definite and pure somatotype

TRUE

Explanation:

William H. Sheldon, PhD, MD, introduced the concept of body types, or somatotypes, in the 1940s. Since then, nutritionists, exercise physiologists, and even doctors have used it to help design effective, individualized fitness plans. The gist is that everyone falls, though not altogether neatly, into the three categories below. Keep in mind that these are generalizations, and that most of us have characteristics of two or even all three somatotypes.

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 )