I have seen one of my friends, go from altmost getting bald to back to fuller hair, just by focussing on getting fitter. Like he got jacked within 2 year period and hair also returned. Testosterone plays an important role in hair growth.
Same thing I have noticed with some other guys in US, whom i know. They all focussed on getting jacked, and not on treating baldness direclty.
The only caveat here, that you need to be "jacked", just doing some exercise and lifting some light weight wont do anything.