Dear Ann,
Thanks for your last letter, and sorry I couldn’t answer you earlier.
Don’t worry about your brother, I’m sure he knows what he is doing. In my country many young people and adults choose different indoor sports to be strong, such as: pool, climbing, parkour so on.I think that the reason why teenagers usually choose dangerous sport is that they have to obtain adrenaline and they have too much energy to spend .Sport in some sense can be dangerous, but if you are a professional, then the sport will likely give you only good.
Actually, I also like extreme sports: I do mountain ski every season also i like free riding.
Write back soon.
Yours friend,
Misha