the gym pacer

the pacer is a track game so you can be fit. what you do in the pacer is you line up  and run when the radio beeps you should be on the other side if you are not on the other when the radio beeps you lose your turn is over.  The object of the game is to run as many laps as you can. My record is 21 laps. Can you beat that. How many laps can you do .