Hi,
I have recently started foundation one, and notice that Jefferson curls are introduced part way through. I am a little apprehensive about this as I have tried to do these a number of times in the past and although they feel fine at the time, they always result in lower back pain for me, not a muscular soreness but a deep back ache to the point that it prevents me working out and interferes with my ability to sit during my work day. I really don’t want to derail my progress, if my body doesn’t get on with an exercise is there any scope for using alternatives?