Broken collarbone but I need to loose weight

Chloe

So I’ve recently broken my collarbone and they put me in a sling. The problem is my boyfriend got us tickets to go on a cruise on the last week of April. It’s my first cruise and I wanna look good for it so I wanna loose some belly fat. But I can’t move my right arm for a few weeks until my collarbone heals. Anyone have any idea on how I should work out to loose some weight without moving my right arm?