Here is an awesome cardio and core workout. You have 8 exercises, 5 rounds with 30 sec of each exercise and each side:
[embedyt] http://www.youtube.com/watch?v=PVXo3o3X-g4[/embedyt]
1. Jump in and out
2. Squat and punch
3.Jump from side to side
4.Step back extend and kick forward
5. Squat and twist from side to side
6. Standing side crunch
7. Alternate palms and forearms plank
8. Plank with alternate feet up