Simple Man documents what he believes is an increase in his testosterone after 30 days of doing pushups.
Before he started, he was often feeling lethargic, which is a pretty common sign of low testosterone levels. After 30 days of pushups, he felt great and after testing himself found that his testosterone levels were actually pretty high.
He attributes his high testosterone level to the pushups.
If you want to test yourself before and/or after you complete this challenge, you can get 20% of the home test Simple Man used: