I think one thing you could do in order to measure your cardiovascular strength you can do a full sprint run. In order to help improve your fitness levels you can swim, jog/run, body weight exercises, and a balanced diet.
The stage of physical development during adolescence is called puberty!
It's a catalytic converter
The afterlife (also referred to as life after death, the world to come or reincarnation) is an existence in which the essential part of an individual's identity or their stream of consciousness continues to live after the death of their physical body.