No pain no gain. Initially it takes sometime for the muscles to get used to the work outs but in 2-3 weeks you'll find yourself with a lot more energy. I used to work out regularly until the crash in early 2017. Looking to get back to it now. Sedentary lifestyle hammering away on the keyboard is dangerous indeed! But it's also one of the perils of the world today where a lot of the work is done using a computer.