2) V-ups: Another term people might be more familiar with is "knee in's.." How many times do you see someone on a flat bench with their legs up just simply bringing their knee's into their chest and back in a super quick fashion? Again, NOT engaging your abs like it should. Hip flexors will give out way before your abs ever will.
Correction: With your butt/glutes (however you want to be politically correct) on the edge of a bench and slight bend in the knee's, bring your legs up and crunch with your abs at the same time, basically creating a "V" with your body. This will really hit the abs without a lot of hip flexor. Pointing the toes down also eliminates a lot of quad/hip flexor strain. If you get strong with this exercise try putting a small dumbbell between the toes.
3) Side bends: This is probably my biggest pet peeve. I see guys doing these ALL the time with HEAVY weight! Dude, what are you doing? If you want the appearance of love handles with low body fat be my guest. What I mean here is that when you do those side bends with heavy weight...that is muscle you are working! You are essentially building the sides which creates the illusion of a thick waist. And aren't we going for a smaller waist/V taper look?
Correction: Just DON'T use weight and know what you are working! You can still do these without weight, there's just no need to bulk that area up!
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