Give the hanging-band 90/90 split squat a try. This advanced variation ramps up stabilizer activity from the core down—so check your ego at the door and avoid going too heavy! The key to performing this movement correctly is to lower your back knee straight down, rather than driving the front knee forward. Descend until the…

I came across this unique abdominal exercise about a decade ago in The Bodybuilding Truth by Nelson Montana. According to Montana, abdominal development is largely genetic, and traditional movements like sit-ups and leg raises are more effective for the psoas (hip flexors) than for the abs. He argues that the abdominals respond best to contraction…