Hockey
Normally subsitute players incase a player gets injured or too tired.
They get too old, they get injured and can't recover, they are replaced by better players.
Yes if they want to and if they aren't too concerned about getting injured.
Because they won't try as hard.
Too Many
Yes, many great sports players take dancing classes or lessons,not only ballet but other types of dace too. Some great sportsman have even been cheerleaders, however not all baseball players do so.
Too many to count...Some players are on again off again playing..thats too general of a question
Too many
no
Way too many!
too many
Too many