Young age teens getting into stuff that they should wait on till they are grown adults!
Answer: Bone Mass/Density
Explanation: Resistance exercise can stimulate and activate bone cells to strengthen even build more bone mass. More technical hormones play a role too, but for simplicity strength training can slow bone loss or even rebuild bones.
Turfe did 2 sets of 100 reps :)
The way the problem reads there should be multiple choices.
Love to help..
I would not recommend this. If you are trying to lose weight simply better your diet by intaking fewer calories per day and burning more than you consume. Always consult your Primary Care Physician prior to taking medications if you take other medications, or a parent if you do not.