Re: Double bass-speed - struggling, pain
Just adjust your technique so it doesn't hurt, I had the same problem with pain in my upper left leg where it meets the hip. I'm into bodybuilding so I can't say that I have weak muscles :P
It doesn't hurt anymore, I just use my calf more and use the weight of my leg to press down rather than lift the leg up I guess.
You don't need to train your muscles for drumming, however core strength is important, if anything you can work out the core muscles.
When you are practicing, try to play every stroke as relaxed as possible.
I've realised that for the feet you only need singles, doubles and possibly triple strokes. Work on those most of the time. Paradiddles and stuff with your feet is good for control so working on that is important as well but maybe not as much.