variable resistance

Embrace some irregularity in your program, and you'll end up prepared for anything.
All strategies are proven to be effective, but when is one more appropriate than the others?
Use all tools available to get stronger. But understand the devices you train with cannot be compared with each other.
Variable resistance training is what you see when a lifter adds elastic bands or chains to a lift. Science takes a look at its effectiveness and the role it plays in power development.