HIIT (high intensity interval training): Too much endurance / cardio work can actually rob your body of testosterone, while
resistance training / lifting is shown to increase the production of T, but this has a
drop off point where too much of either robs the body; a moderate amount of strength training and cardio together make the optimal blend to produce T. Lifting more than three times a week can actually
slow your T production way down, so don't overdo it.