This 5 hour course introduces the concept and principles of Dynamic Variable Resistance Training so you can take your fitness education and coaching to the next level. (strengthinmotionstudio.com)
Typically, the use of variable resistance in weight training includes the attachment of elastic bands or chains to the barbell. (fitnessandpower.com)
It's called linear variable resistance — meaning that the load increases progressively with the movement. (fitnessandpower.com)