I’m on the second phase of the WSP and so far it’s going great. I have a question about day 1. I looked the forum and didn’t find the answer so I’m bugging you…(-:
How can I do 4 reps of Swiss ball crunches on a 6 RM?
i.e., how can I make the crunched more challenging?
Also, my knee really hurts from sprinting. Does elliptical HIIT can be considered a good replacement?