French Montana - Pop that
Yeah, songs for workout with rap rhythm are awesome and if you add besides French Montana, some known rappers like Drake and Lil Wayne, then you'll have even better workout music!
By the way, have you noticed Lil Wayne's weight fluctuation? He found a way to ensure him some muscle gaining through workout and diet at one point and now he's skinny again. You could see Lil Wayne's muscles and slight weight gain in the video "Bed rock" but that's gone now :D.