not windmill advice but.. wear these or some kneepads
slamming your knee against the ground is feelsbadman.jpg and will restrict your training.
Second this. Sara @ PAW makes them custom to your measurements, they’re not too bulky and stay in place. I use mine with McDavid knee pads underneath.
Just recently got this McDavid for my bursitis on my knee that made it almost impossible to base on it. Works perfect. If you are on the heavier side I would recommend getting the with the shorter sleeve. The octagonal separation works so much better than a traditional knee pad.