Jack Knife Crunch - Watch all active muscles

[@peace606]

Very educational thank you! Would love more.

[@aksharalearningskills2097]

Very useful to all thank you for uploading

[@MuscleandMotion]

baby dance dance Thanks for following us on YT! For more videos, you should check our Strength Training app (On all devices)

[@kroxxy123]

I love this. More please

[@angelalcazar9350]

Amazing, We want more about this muscle 😍

[@adonis22_75]

This is beyond great!!!!

[@daevif]

So cool

[@amilton1015]

Again great/useful lesson

[@ОльгаХодун-э5ж]

Amazing 👍🏻❤

[@googleuser25]

Amazing

[@dhanushkarajapaksha4821]

Best

[@gladysmaroue9167]

110 degrees is best for hamstrung muscle and beginnernabs

[@tillamatila5280]

im so confused about praticing and watching many gym explaination abaout pelvis and lower back " need" in exercise that i should keeo my lowerback flat and curl my pelvis upward a bit in crunching or moving my leg along with pelvis in leg lifting. But study Pilates certification now. Its about keep the pelvis in neutral position all the time where my lower back have small curve during doing abs workout. Pls give me some advices >.

[@ahmedsamsung7608]

الترجمة للعربية

[@gladysmaroue9167]

Holly Orange Cray On Ocala

[@hixcrip]

Sir pls guide me,when i do this exercise there is a sound in my hip flexion and becomes severe when i do it constantly

[@bonifaciocadiente1875]

Does it work the upper ab?

[@新光醫院復健科]

Arm elevation

[@don1738]

When you try the carnivore diet for 500 years