I signed up and beforehand clearly stated that i was a complete and total beginner - never in my life had i run longer than a block, smoker, hated exercise (but trying to change), etc. they assured me that they had beginner sessions. boy were wrong. every session involved running at least 1 mile - for someone who could hardly run a block, this was way over my head. at the 3rd session the pack disappeared onto a trail and no only was there no way i could keep up but they didn't even notice i wasn't with the pack, I ended up just going for a walk by myself in the park. i asked for my money back and to their credit they did give me a refund. probably good for someone who is already in reasonably good shape, for someone starting out stay away.
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