When you lift weights and rest only 1 minute between sets, your body releases more stress and sex hormones right after the workout — but only at the very start; after a few weeks, this effect goes...

One workout, whether heavy or high-rep, doesn’t change your testosterone levels in the hours after.

For men who lift weights regularly, the body's testosterone reaction after workouts was about the same whether they did short, intense sessions or longer, higher-volume ones, and this didn't really change over 8 weeks of training.

Even if you lift heavy or light weights for 12 weeks, your body’s short-term hormone spike after each workout doesn’t change—and that means those hormone surges probably aren’t why your muscles get bigger or stronger over time.

Even after a super hard workout, the body’s baseline testosterone level doesn’t stay high the next day — it goes back to normal quickly.

In sedentary young adult males, performing structured sprint intervals for two months lowers cortisol levels in the blood without changing testosterone levels.