You guys know how difficult it is to stick to workout routines...almost as tough as sticking to one girl

Anyway, I've been on and off P90, P90X, Insanity, and Combat. Even though I didn't finish all of them, I can tell you that they all work to some extent.

Time - 30-45 min a day, 6 days a week. 90 days.
Equipment - dumbbells or resistance bands
Two phases. Two intensities. Resistance and cardio alternate every day. Each phase is 45 days - feel free to extend or shorten each phase as needed. This is perfect if you're short on time and are just getting started with fitness or are too out of shape for something more intense. Expect slow progress in the first phase. As soon as phase 2 kicks in, you're gonna wish you were back to the lower intensity workouts. Your hard work will pay off!

Time - 60-90 min a day, 6 days a week. 90 days.
Equipment - dumbbells or resistance bands, pull up bar (or resistance bands with a door attachment), yoga mat (ABSOLUTELY NECESSARY)
Before I begin, DO NOT SKIP YOGA. IT'S ALMOST AS GOOD AS SEX. SURVIVE FOR AS LONG AS YOU CAN. Ok, with that said, this is a very intense workout program. As for results, I give you a week before you see serious changes in your body. You can bulk up or cut down. There are three phases and three different types of routines. I'm not gonna into details on each workout because you have the websites for that, but each workout will wipe you out until you build enough endurance. IT alternates between weights and cardio and there is so much variety! You should do this if you have the time to commit, regardless of your fitness level. DO THE YOGA, OR AS MUCH OF IT AS YOU CAN. NEVER SKIP IT

Time - 40-60 min a day, 6 days a week. 60 days.
Equipment - yoga mat, but not necessary.
Ok, this motherfcker is for masochists. It will work you in ways you haven't been worked before. It's straight cardio, so if you're in good shape, give this a go. It's in two phases. Phase two will kill you if you're not careful. Overall, it's gonna slim you down and improve your flexibility. There's no yoga, but some of the stretches are yoga-inspired. It's a great workout if you're looking to lose weight, but not if you want to bulk up. You'll see a difference within the week.

Les Mills Combat
Time - 30-60 min a day, 5 or 6 days a week. 60 days.
Equipment - MMA gloves or hand wraps to help you make a good fist. Dumbbells or a barbell.
I LOVE this program. If this were to be a girl, I'd have oneitis. It'll bring your shoulders out, improve your flexibility and balance, chisel your arms, bring out your abs, teach you to punch and kick and it's a blast. I recommend this if you're trying to lose weight (give it a week) or want to work out for "function" as I like to call it. A serious drawback to this is that it does not have enough resistance training if you're looking for that kind of thing. Any fitness level is appropriate. Oh, and the trainers are British

The workout I'm doing now is a hybrid of P90X and Combat. There's just enough variety and engagement to keep me committed. If you plan on doing this, PM me and I'll send you the schedule. In terms of commitment, it's about 45 - 90 min a day, 6 days a week. 90 days. Each workout goes by really quickly and you don't notice the time going.