In the NFL there are very few players who play two positions. Typically, if they do it is either on offense or defense and then possibly a special teams position.
offensive tackle
They run drills on whatever positions they play.
On offense it would be the players that play on the offensive line (positions: tackle, guard, and center) and on defense it would be the players that play on the defensive line (positions: tackle and end). These positions are the ones closest to the ball when it is put into play.
No, NFL players typically specialize in either offense or defense and do not play both positions during a game.
Yes, but they can not receive forward passes
"look good, play good" is one of two reasons! the other one is that on some positions you don´t often need them!
yes, yes you can because college football is something like middle school football i play two positions runningback and safety
Centerfield and Shortstop.
left field and third base
The positions in Arena Football are the same in NFL football
Firstly both play at two different positions , so how can you compare them.
yes you have to because if you do not you can not play in the NFL.