After performing another 3-4 working sets using the chair to aid youif you need it
, move onto a reverse grip, this will hit the overallbiceps but more the outer biceps and the back of the forearms.
Perform another 3-4 working sets, the same as before bringing yourchin just over the bar and squeezing and stretching the biceps musclesas much as possible.
Try these biceps exercises without weights for when you are stuck forgetting to the gym or just want to workout at home.