Kneel with a resistance band anchored behind you and hold the band ends at shoulder height. Keeping your core braced, crunch your torso downward toward your hips in a slow, controlled motion. Focus on squeezing your abdominal muscles while avoiding pulling with your arms, then return to the starting position with tension still on the band.
Log your band kneeling crunch sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.