Sit ups are not the best exercise for toning the abdominals. If you are
looking to tone your mid section any form of crunches is likely a better option
than any form of full sit-ups. If your fitness goal is to become stronger at
sitting up, then sit-ups become a sport-specific functional exercise which is
necessary for your training program. Plate situps take it a step further adding
extra resistance as well as a shoulder press motion. The shoulder press can
actually make the sit-ups easier but there will definitely be a failure point
during these plate situps whether it is your abs/hip flexors or arms/shoulders
is the only question. These plate situps can be performed during any workout for
those looking to increase explosive sitting up power.