An indicator that training may need to be regressed would be A.improved agility
B.reduced blood pressure
C.reduced performance
D.improved balance

D

seen it in my key answer

A warmup gradually revs up your cardiovascular system by raising your body temperature and increasing blood flow to your muscles. Warming up may also help reduce muscle soreness and lessen your risk of injury. Cooling down after your workout allows for a gradual recovery of preexercise heart rate and blood pressure.