You should warm up for about before being physically active

At bare minimum, your warm-up period should be five minutes long. If you are practicing an intricate sport like gymnastics or ballet, you need much longer than five minutes to properly warm up. Also, when your muscles are extremely sore from a previous workout, you will need to take more time to warm up.

Source:livestrong.com

Hope that helps feel free to ask me more questions!!

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5-10 minutes (apex)

Explanation:

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise

what effect does exercise have on the nervous system?

the answer is c.