Sofia is planning her physical activities for the week and wants to choose an activity that will her build stamina. she should choose an activity that

That makes her heart and lungs work harder.

well wheres the question

starvation is bad because your body needs nutrition and to deprive it of nutrition can cause problems with both health and fitness.

explanation:

it can make weight loss slow down over time, but it won't cause someone to gain weight depsite restricting calories. starvation causes weakness in the senses like thirst.