Planks are better than crunches for working those abs. Here are 8 plank variations to try!
Great to use everyday no matter where you are each day
Good article with tips to modify each exercise to fit your training level. Also some new exercises I hadn't seen on other sites yet. 2 videos -one showing how to do a proper burpee -one showing how to do AB SNAILS (triceps, shoulders, abs & traps!)