Heel injury?

Cook_27

I've been doing the 30 day shred and was almost done with level 1 when my heel started hurting pretty bad. It is the upper side of my heel and it kills me trying to do the jumping jacks or jumping cardio with the shred video. Has anyone else had an injury like this. It is only my left heel, and I can't give the shred my all when it hurts to do the cardio. What are some other ways to keep my heart rate up during the cardio circuit?