1) is the first one.
2) martial arts
3) it should be moderate to vigorous...
I'm not 100% positive about the second one because I wanna think it would be all but yoga is not a moderate activitie
The answer is the quadricep muscles. They are engaged whe you use the leg extension machine.
Hope this helps! :)
Your right leg...I believe it differences in if you are right handed or left handed
