Up to about 150 minutes (2 hours and 30 minutes)
Answer: Track relay racing
Throwing baseballs puts a high impact on your bones and muscles causing them to increase in strength and muscle. We see the same thing happen in volleyball and basketball. However in track, the explosive movements do not put the same amount of pressure on your bones causing it to be the least likely to increase bone strength.
The two years are between 12 and 15
