yes
For running long distances it is better to wear running singlets rather than an ordinary tank top because the singlets allow for more air circulation and less chance of over heating.
The wearing of school wrestling season singlets out of season is up to both your coach, booster club and even the state, there are many strict rules for things like this, i know that in my school im not allowed to where season singlets provided by the school in my off season wrestling, i suggest you ask your coach for an old school singlet, which is what i did and i wrestle in that.
They are a BIG part of some cultures and that is like saying aussies can't wear singlets, shorts and thongs!
athletes would be naked.
Many times amateur boxers are fighting for a team. The singlet makes them easily identified by judges, referees, and fans.
nothing
Some people that wear compression shorts are athletes. Athletes wear these because they are nicer to run or do whatever they are doing with them. Makes it a lot easier on them.
Alot I can not name them all.
because to get the grip
nothing (They competed in the nude.)
john cena