Practice good technique for true advancement in double bass playing.
Any mention of the double bass drum to a drummer can bring excitement. As with any instrument, however, practice alone doesn't create perfect playing, though it is helpful. A drummer who practices using the right techniques will go further musically than one who drills with the wrong techniques. Good techniques will enable you to play accurately.
Build Up Your Weak Leg
Every drummer usually has one stronger leg and one weaker leg. Usually, your right leg will be stronger than your left because most people are right-handed. If you've been playing bass drums for awhile, this will have strengthened your right leg even more. To even out your leg strength, look into using a program to build up the weaker leg. Kenny Aronoff's Power Workout Book is one starting point, and the program will help both legs. Your bass and double bass playing will become smoother and stronger.
Play with Barefeet
Some double bass players say that if you play with shoes on, it's like wearing heavy gloves. Your foot needs to retain sensitivity and reaction, and it does this best if you play barefoot. This isn't always possible if you're playing a gig, where the room may be too dirty, combined with the danger of broken glass. However, you can practice barefoot to improve your playing, and you can wear the thinnest sole possible when playing a gig. For difficult work, playing barefoot is suggested.
Use the Heel-Toe Technique
Double bass can be played with the heel up or down or anywhere in between. However, some players find that the heel-toe technique produces the best sound. The heel is the first hit, and the toe is the second hit, done in a rocking motion. Practice this slowly at first, working up speed. Remember not to lock yourself into one particular position. Watch other double bass drummers, and experiment with the positions you see them using.
Body Position
Practice sitting on the stool, using your legs as support. If you can successfully do this, your leg will be able to move much faster because you're only using it for playing, not for body support. Sit at a 90-degree angle, not too high or too low. If you let your feet just brush the pedal, you'll be able to move faster in the long run than if you sit lower and push at the pedal.