Explanation:
the answer is the aerobic exercise. when first starting a regime, drs agree that you should start at a slower pace for safety and building up to a more intense exercise, when you gain strength.
I would say hat now is the perfect time because peak bone mass happens at our age. Bone strengthening exercises are always good for your body no matter what, so encourage her/him to do it. I'm guessing the age is about 11-18 maybe...
Hope this helps... mark as Brainliest plz
