Well, workouts, like many other productive activities, feels stressful at first. As you remain consistent on the path, it becomes easier.
As for meditation, it's not really what you think. It isn't about remaining thoughtless although that state can be achieved if you are dedicated to the path, you can start by focusing all your attention and energy on one thing, dissolve all other thoughts in that one thing, don't resist them, just dissolve them in that one image, thought, or even mantra you're focusing on.
From your name you seem to be a Muslim, if so, you can focus all your attention on one of the names of Allah or a supplication. It is also a form of meditation. Thoughtlessness is a form of meditation but not the be all and end all.
See? Not that much of a talent now huh?
Thank you. I will try it