Since August of 2014 I had been losing my hair. More and more of it was showing up in the sink drain. Earlier this year I got worried because it increased. I wasn't sure if it was a temporary thing due to stress or illness so I started saving up the little clumps of hair between paper towels and date stamping them. It just kept getting worse and worse. I got a blood test to check hormone levels and find out if everything's ok. I'm waiting on the results.
Last month I got tired of it all, and decided to experiment as a last ditch effort to prevent baldness in my late 20s. I started short but high intensity exersizes every 1 hour, for about 2-3 minutes. After only 1 week new hair has started sprouting up on my scalp. And the amount I've seen in the sink drain has gone down drastically. This is very odd because there's a huge delay in when hair grows and falls (often months) not 1 week. So I'm convinced it's the exersize that's increased circulation, jump started cell growth, and maintained healthy hormone levels. I need to test this out in the long term and try to get other guys to participate. I doubt it's a coincidence because 1 week I skipped my exercises and my hair growth decreased a bit and hair loss increased a tiny bit.
tl;dr The right dose of exersize for a healthy head of hair. Possibly.