Here is a modified plank position which is going to strengthen your arms and core muscles, as well as giving you a cardiovascular workout! I remember doing this move in the Insanity workout and I can feel why Shaun T LOVES this move!!
How to: Start off in the classic high plank position, but take your legs wider than shoulder width apart (in the picture I have made it more challenging by bending my elbows slightly as it works the chest just like in a push up!).
Now jump your legs together into the classic high plank stance. If the jump makes it too challenging, try bringing each leg into the middle one at a time and then reverse the move (in, in, out, out!).
Now you: See how many you can do in 1-minute. Rest for 10 seconds and repeat for 2 more rounds!