I am all about 'more bang for the buck' when I exercise. I want to get as many muscles involved in the movement as I can! So, I have a fantastic exercise for you to try....not sure what to call it, so I will name it, 'Bosu Bicep Curls'
Once you have found your max weight to curl, sit on a Bosu Ball, feet up off the ground....
get your balance.....then you are going to curl the biceps, 12 reps, 3 sets...while keeping your feet off the ground. That! is the tricky part! Don't lose your balance!
You engage your whole core the entire time you work...FANTASTIC! TRY IT!