ftentimes you will see NFL running backs training using parachutes attached to their back while they run. In 1–2 sentences, explain how, in terms of the forces acting on a runner, wearing a parachute changes the net force, and why practicing with a parachute can make a runner stronger.
Wearing a parachute while running increases air resistance, which results in a larger opposing force on the runner. This change in net force requires the runner to exert more effort, ultimately making their muscles stronger.
