I know three people who do archery. One does it for a hobby and the other two for hunting.
All three of them have torn their biceps at one point. When they're drawing the arch, they use their biceps instead of their back muscles to do it. Now they've smartened up and use a device that protects their biceps while drawing.
It's a nasty injury though because it requires surgery, not to mention that it's painful and ugly looking.