Im trying to FS a bench about 7 ft long and 3 ft high... its about 1/2 ft higher then what I have been grinding. However, I cant seem to get my back foot to lock on good enough to slide more then a few inches... I get my right foot to slide all the way down (ive tried grinding with one foot and can grind it all the way down)

any advice? should I try to bend my knees inward more?

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