Is anyone still doing these DVDs or has anyone had good results? I had it on my wish list for a while and snagged a copy of endurance for $4 shipped on Amazon. I liked it instantly and ordered Power. I'm debating if I need strength or not. I'm wondering if you can really see results in 3 weeks just doing it 20mins/day. It put the brakes on me trying 21-day fix for now. I'd I've any feed back or rotation tips, thanks!