Stem cell research is a fascinating area of biomedicine. Science is just beginning to scratch the surface on how far their potential can go.

This article will focus on the spinal erectors, when one needs to place a focus on them, the exercises/equipment used to strengthen them, and how the variations should be used, progressed, and changed throughout the training process.

Where part of the problem lies is in the assumption that a single should always or usually be heavy or maxed. The single, the heavy single, and the 1RM should really be seen as three different terms entirely.

Your body type and movement patterns will determine which variation of the split squat to focus on, but cycling through all variations in an intelligently-designed program will provide the greatest benefit.