Which parts of the body act as levers?

bones act as lever arms

joints act as pivots

muscles provide the effort forces to move loads

load forces are often the weights of the body parts that are moved or forces needed to lift, push or pull things outside our bodies.

Explanation:

well say a good goal is to do 150 sit ups in a week! or 90 pull ups a day. even 60 push ups in a month these are all fair goals!

answer; (d) braking faster then cars;