Right! I am a veteran of various types of exercising to lose weight. I find it really tough to limit calories below 2,000 per day. When I do manage a 'good' day eating I tend to sabotage myself with 2 glasses of wine. From a size 22 I got stuck in a rut at size 12 for months and months. I was getting fitter and fitter (getting better personal best times in running half marathons) but the wobble remained. This is basically what I have been up to and how different exercises have affected me (BTW I am 5'7"):
16 stone, very unfit
I got a 2nd hand elliptical cross-trainer and set it up in my flat. I built up to doing 30 minutes on it 5 times a week and eating healthily in the first heady rush of addressing my size. Lost over a stone in 2 months. The good thing about a cross-trainer is that it is low impact for over-loaded leg joints, you can keep going on it for a long period of time at a moderate heart rate (which racks up calories burned without over-exerting yourself), and it's straightforward and easy to stick to. That's why most starter exercise programmes focus on low-impact cardio to begin with.
15 stone, a bit more confident
I started running at a slow pace (with walking intervals) in my local park. Over the course of another couple of months I built up to running continuously for 30-40 minutes, losing another 1.5 stone in the process. This was basically an extension of the above cardio-only approach but increasing the intensity of the workout, burning more calories in effect.
13.5 stone, eyes on the prize
I bought the 30 Day Shred and it was a bit of a revelation. Adding resistance/circuit training to what I was doing meant that I was increasing my strength to push myself harder in cardio sessions - plus increasing my metabolism which accelerated weight loss. I kept up my running (by the end of this 6-month period I could slowly run for 6 miles without having to pause to walk) but did 30DS sessions 5/6 times a week too. I quickly lost another stone and joined a gym.
12 stone, aiming for a half marathon
At the gym I extended the movements I had picked up from 30DS, but did more sets, or with heavier weights. I would do about 20 mins of this after a warm-up and then do cardio like a treadmill, cross-trainer or spin class session 3 times a week. I went for a long run at the weekend, building up to 13 miles. My weight loss continued but slowed down because at this point my diet habits became a bit more chaotic. Getting to 11 stone took a few months. I ran my first half-marathon in 1 hour 55 minutes, weighing 11 stone.
11 stone, the rot sets in
I signed up for another half marathon, and I wanted to do it faster this time. This meant that I mainly focused on running throughout the week and would do resistance training every now and then. Weight loss almost ground to a halt, but I did manage to do a 1 hour 50 half marathon 6 months after my first one. I was confused, because I was burning through SO many calories running, and for long distances and at a decent pace, but as I later learned I was burning the wrong kind of energy.
11 stone, goes to see Personal Trainer
Earlier this year I got a special deal to go and see a personal trainer. She made me stop focusing on the weight on the scales and instead on my waist measurement and my body fat %. To reduce body fat when you're already fairly fit, it's not as easy as calories in vs. calories out. She put me on a programme mainly focused on lifting weights (it's almost impossible for women to build significant muscle tissue bulk, so looking like Arnie will NEVER happen unless you put yourself on special supplements) and short, sharp interval training - I reduced the overall amount of time I spent working out every week by about 30% or more. So far I have lost another half a stone, and look set to hit 10 stone later this summer. My body fat percentage has reduced from 31% to 25% in 3 months. I can see my abdominal muscles (just), and I generally look like a total babe.
So - in summary - cardio to start with because you can do it slowly for ages and rack up lots of calorie burn. Then transition through to introduce more resistance training and more intense training. (My interval sessions last only 20 minutes but I am DEAD afterwards - purple faced and totally drenched). I still do long runs at the weekend, but because I am lighter and stronger I am getting faster. I am aiming for a sub-1 hour 45 mins half marathon in September.
Sorry for length of post. It's something I am very passionate about.