Then I found the DB Method—a machine that turns squats into a cardio workout while relieving all the pressure on your joints. It took weeks (OK, months) before I felt like my form was perfect ...
For example, in lieu of an ab rotation machine, you could work your abs ... For example, lower-body exercises like squats can also strengthen your arms and shoulders as you hold a weight up.
Aaron Horschig (Founder of Squat University). In a recent YouTube video, he shares his favourite exercises that help to enhance spine stability and give you, what he likes to call, “usable abs ...