The key to fitness is consistency, so set yourself up for success with ab equipment within easy reach. Benches, BOSU balls, sit-up bars, exercise wheels, straps make it easy to get in some extra crunches at any time. So you'll be ready with abs of steel for the next beach trip or pool party.
If our office had guys sitting on stability balls saying it's good for their core, I would be skeptical. Then again, I might just get one of these ab benches, and that way I'd be cut in time for any beach occasion.