Other moves you might do at OCS are bear crawls, in-outs (start in the push-up position, hop your feet up and forward bringing your knees towards your chest, hop them back out to the push-up position, hands stay planted throughout; similar to mountain climbers but with feet moving together instead of alternating), rifle squats (done in RLP, basically bodyweight squats while holding weight out in front of you with your elbows locked out, five pounds each should be more than enough since the rifle is about 7 pounds). That's all I can think of at the moment, you hit the rest.
Oh, and a note about sit-ups, be prepared to hold in the up position at the end during things like PFA's or mock-PFA's, i.e. at the end of two minutes timing for the sit-ups, the DI's like to go "STOOOOOOOOP" and they usually tell everyone to respond "STOP AYE AYE SIR GOOD MORNING SIR!" while you're in the up position, and they'll repeat STOP once or twice while they wait for everyone to get to the up position and respond appropriately.
Good times.