This has a lot of cardio, hence the name CARDIO XT. It was a bit challenging only because it was a new workout of week 2. Sprawl and Brawl and Cardio XT alternate every week. Sprawl and Brawl was much more fun. I also didn't perform as well as I should have, due to a blister on my foot. I thought it was healing, but as I was doing this workout again barefoot (I feel like sneakers weigh me down), the blister reappeared and it felt like it popped so it stung a bit. But I pushed through and did the best that I could. That's why I put on my socks and sneakers near middle end of this workout.