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Hook

Their other posts in the index, biggest breakout first.
challenging one by far is the hanging knee raise and if I was one exercise for the rest of my life it would be this. you can do this without any equipment but it does rely on you having quite decent amount of upper body strength. if you don't you use these I've had these for years ab straps we want to try easier and for me it just takes my upper body out of the equation I just focus on training my core down slowly just to here 90 degrees and then back