Men’s Health discusses the effects on the body as a result of completing 30 burpees a day for 15 days straight.

“Burpees target every muscle in your body and train your cardiopulmonary fitness by repeatedly bring your heart rate up and down,” explained Jordan D. Metzl, MD, sports medicine physician at HSS. Extreme exertion – such as burpees – release endorphins, which give people the boost needed to get through the day, he noted.

According to Dr. Metzl, irregularity in progression is normal and can be attributed to two things - the body still getting used to the exercise, and external factors such as sleep intake the night prior.

Read the full article at Menshealth.com.