Well I haven't but I've missed telling you about it!
Today's cardio is not for the weak...
You'll need a spin bike (regular bike is fine but dont even bother on that lame seated one), treadmill, stair master and an elliptical with optional moving arms. You can sub any machine if one is not available but make sure they are all different.
What I did:
1 min warn up on the spin bike a nice moderate speed
4 min increase tension and stand
Switch
5 min walking lunges on the treadmill
Switch to stair mill
1 min straight step
1 min facing left (stepping up sideways)
1 min facing right
1 min single step flex/ slight back leg lift at the top
1 min two steps at a time
Switch
10 min on elliptical with arms
Every other min switch between steady arms on handles and crouching sprints with your arm stationary.
Switch back to the stair mill
1 min straight step
1 min facing left (stepping up sideways)
1 min facing right
1 min single step flex/ slight back leg lift at the top
1 min two steps at a time
Switch
5 min walking lunges on treadmill
Switch back to spin bike
4 min same increased tension standing
1 min sitting and an easy speed.
STRETCH and enjoy!
Good luck!