I'm new to this thread, but I thought I might share what I'm currently doing/attempting along with some disciplinary advice.
I had a workout routines thread going...but realized it was redundant and the topic was already covered here.
So the workout I've adopted lately and decided to go far with, is actually martial arts training. One common misconception about martial arts training is that it's all about the techniques and fighting. This is really only about (at my early levels of experience) half of it. Warming up alone is in and of itself an intense workout. Not to mention the practice of various striking or even weapon techniques in addition to the rather intense warmup is a major workout.
I don't necessarily do ALL of the workout every day or all at once, mostly due to my inability to wake up early in the day and my evening work schedule (I usually get up about 2:00 giving me time to do whatever before I work @ 5:00). Sometimes I'll squeeze in another full workout at night when I'm watching a movie or something as well (the twice a day workout still pretty much kills me, but man it feels good.) Obviously the during tv workout does not include running.
So here's what I do:
Before running I'll do some light stretching and between 75-150 jumping jacks depending how spry I'm feeling. I don't feel guilty about cutting a corner here or there because as a whole the workout will still be enough. After that tiny warmup, Sprint training for one mile (one mile is the goal. Right now on my first day I did a half mile. Don't bite off more than you can chew. I've always been in very poor cardio shape. However I quit cigarettes (but not weed, never weed. judge away on that drug snobs), andam feeling better than I ever have since I started exsersizing more. The sprint training starts out at a light jog, then you burst into 30 seconds of as-fast-as-you-fucking-can sprinting for 30 seconds, then bring it back to a light jog (or if you're just starting out like me a walk), then build it back up and repeat until you've covered your chosen running distance.
Some stretching (always stretch!!! don't overdo it, but stretch often. Like twice a day do the full body range of stretches.)
This includes neck, shoulders, arm swings, hip rotations, arm rotations, touching your toes (omg~ I actually can touch my toes now), "reach for the sky", side-to-side,the splits, toe touching while sitting, hurdlers, butterfly.... there might be a couple I'm forgetting. You get the idea. Full stretching.
Then once I'm all limber, it's time to start the warmup...no, the running was not the warmup...yeah, it sucks.
Squat thrusts with one pushup when you're legs are extended. These are BRUTAL. Remember to keep your core balanced and flexed or squat thrusts can murder your back. They are awesome cardio. After 20 I feel kinda like dying. Also they work many many areas of the body that might otherwise be overlooked and rejected.
After squat thrusts I'm trying to do this bear crawl that I got from youtube. But mountain climbers are good for beginners. They're not by any means easy or fun. Or if you're feeling badass, you can do both. The bear crawl focuses on control, speed, and agility. Check it out.
....after that stuff.....ab workout.
20 crunches(give or take a couple) Go up all the way and hold for 2 seconds at the top on each one. Not all the way up like sit-up. Quality > quantity.
20 leg lifts. Laying on your back, have your legs extended all the way and SLOWLY lift them up vertically, then SLOWLY lower them.
20 or so Reverse crunches. Bubbly lady, but she shows a good technique. reverse crunches
The 20 or so bicycle crunches. These are pretty rough. Basically crunches bring your right elbow to your left knee, the the opposite side, repeat. I hate these. They're hard.
Now it's time for pushups.
10-20 Diamond pushups. Just form your index fingers and thumbs into a diamond shape and put it under your chest. Then do that as pushups. It's pretty hard, but very worth it.
3-5 Superman pushups each with a 30 second hold at the top. This is awesome for your core (abs and back.) Be very careful if you have lower back problems. The initial raise-up can be a shock to that area of your back if you're not prepared.
Then as many regular pushups as I can do.
That's the end of the warmup. Yeah. That was just the warmup.
After a short water/meditation break. I practice a few different basic kick that I learned when taking martial arts classes. Roundhouse, sidekicks, snaps etc. If you decide to practice this stuff, remember that accuracy and form come BEFORE power and speed. Kicking down a door is not impressive if you also dislocate your leg and pull 12 muscles because you missed and hit the doorframe way too hard.
I like to move around between kicks, punches, blocks and small combinations of the three. Like tae-bo with less repetition and more flow. When you know some steps and how to punch kick or block, you can string them together and not only get an awesome workout for both cardio and muscle, but it's lots of fun and even looks cool. The technique practice part of the workout lasts at least 20 minutes, but up to as long as you can go.
I also do some training with a bokken (wooden samurai sword). It's a FAR better workout for the upper body than you might think. It's also great for cardio once you can swing without hurting yourself. If you practice properly with the correct stances and footwork it also promotes good posture and mental focus.
I'm doing this workout 5 times a week. Not necessarily all at once or all 5 days in a row. Sometimes I'll skip a day and make it up later. Sometimes I'll do only the running and/or warmup during the day and then warmup and practice techniques late at night. Just always warmup before practicing techniques. At minumum the workout lasts 30-40 minutes if I'm hurrying through or cutting more corners than I should. But even then it's pretty intense. I've really only been doing this for a couple weeks and I'm already seeing noticeable results (I am, of course, biased on my progress, but still. I do already feel better.) Oce I'm mobile again, I'll be taking martial arts classes 2-4 times a week. I also want to incorporate some swimming (best excercise in the world) at least once a week and eventually once I've trimmed all my fat and am more agile, a fully body weight routine once a week. Of course that's all supplemental as the martial arts training will overshadow anything else aside from running I do.
My ultimate goal (aside from being sexy, dangerous, getting laid once a year or so) is to get in proper shape to go here :
Like...omg WOW
Hopefully this helps some people. All I can really say is that if you want something badly enough, you'll get it. Whatever it takes.