Which form of exercise combines stretching with movement against resistance and often involves the use of devices such as tension springs or heavy rubber bands? which form of exercise combines stretching with movement against resistance and often involves the use of devices such as tension springs or heavy rubber bands? weight training yoga static stretching pilates?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point