I started using CCs with my outside runs, and love, love, love it! I used to get so bored within 30 mins of starting a run, I'd quit, even though I still had energy to burn. I was always watching the clock (can I turn around yet? Is it time to go home now?). With the CCs I'm running farther, and it feels like the time flies by. I don't even bring a watch because I know the workout is X mins long, and I just have to follow Sean's cues. I love the mixture of tempos and intensity. It keeps the workout interesting.
My only problem is accommodating changes in resistance to simulate hills. I don't have anything beyond a mild swell in my area, and it isn't big enough to make the challenge last as long as Sean makes them. The last time I tried CC#4, I did quick-paced walking lunges for the hill challenges. That seemed to work okay. I would still prefer to actually run up a big hill, but given I don't have that option, the lunges were a decent compromise. They only comprise a small portion of that particular workout.
If any other outdoor runners have ideas about how to create hill-resistance when there ain't no hill around, I'd love to hear it.
Cheers,
Sandra