I felt like that before..
I say it's normal. It's all part of growing up.
Everything's going to be okay!
We got your back! <D
Explain that even though he has already had sex, it is ok to change his mind.
Suggest that he talk to a trusted adult.
The other options may offend a person
Crunches
In my educated opinion, crunches would be the best choice out of these options to build strength. A one mile run builds cardio, sit and reach and gymnastics build flexibility and some strength, crunches is strictly abdominal strength.
