What's the most efficient exercise to burn cals?

Jumping rope and running are some good ones

5 sets of 50 rep squats with a barbell. Take a two minute break between sets and increase weight by 5 lbs every session.

Im no expect but I'd expect any high intensity interval type of cardio exercises would get you a decent burn in terms of calories burnt.

Running has been a great one for me. Relatively quick, I started out with just 10 minutes a day and after 3 months find myself running around 30 minutes per run. Burns lots of calories per run. I've started supplimenting a run witha few sets of calisthenics (jumping jacks, sit-ups, push-ups, and resistance bands). My energy level at the start was very low too. I didn't realize when I started running I would end up craving more. Started 3 months ago and tended to burn about 80 to 100 calories per short run. Now I tend to burn between 400 and 600 calories per session (run and calisthenics) and do this 5 to 6 times per week.

Just start small and the key is to stick with it. It'll grow from there.

the one that YOU enjoy and gets your heart rate up and gets your @$$ up and moving. A LOT of people on this site seem to be an expert at what exercise is the best..no it's the best for THEM!

I walk 6 - 7 days a week..and I'm totally losing weight AND BUILDING MUSCLE! I don't have to be in the gym lifting weights or running. You will read a ton of threads that say if you aren't lifting you aren't building to which I call bullsh*t.

Bodyrock.tv has HIIT (High Intensity Interval Training) videos. They are generally 12 minutes long. You do workout intervals of 50 secs of work and 10 secs of rest twelve times. There is cardio and strength training involved with these workouts and they target your core. I suggest you try it out. I must warn you, though, that some of the women are scantily clad and the camera shots are sometimes...looking at the wrong things. However, if you can get past that, I'm sure you'll see results as I am if you stick with it. I generally burn about 150 to 200-ish calories but I'm also really out of shape so I have a lot of pedestrian moments.

I have been working on maintaining my weight through exercise for 10 years. One of the things that has amazed me over time is that if I get home after work and try to do something by myself, I fail. But, if I stop and exercise on my way home or immediately after work, I get huge amounts of energy from the workout! Its really cool. I have found that any exercise works. I do most of my workouts with other people and that helps too because I know my friends are counting on me. I run, bike, lift weights, swim, walk. My commitment is to do an hr a day of something 5 days a week and I plan what I am going to do on Sundays so that I don't get overwhelmed by my work week. I

I like running, I started with the couch 2 5K program app on my phone. For the first several weeks of the 9 week program the entire workout only takes 28 minutes and its every other day. By the end the workouts are still only 35 min and maybe by then you will be enjoying it (like me) and you will want to push yourself to run longer. I'm running about 4 miles and burning about 115 cal per mile. I'm a very slow runner

While I am very active, I find the most efficient calorie burn for me is the elliptical. I can get a 500+ calorie burn in a 45 minute session.

I would highly recomment interval training. You alternate between high intensity and low intensity, such as 30 sec high then 1 min low. During those 30 seconds push yourself really really hard. Then go back to a normal workout pace to catch your breath. Do not take it easy per se, but take it down to a manageable pace. Then after a minute go back that high intensity for 30 seconds. You can do this with any type of cardio (running, biking, elliptical). It is amazing. It challenges your body, and keeps it guessing. I think this is key. This works really well to maximize the shorter amount of time you have to work out as well. Maximum burn, less time. Also, fit in some strength training. As we get older, our bodies easily create more fat and less muscle. Less muscle means less fat burn. So, by doing some strength training we can offset this natural tendency as we age. The biggest thing to remember is to push yourself. It's not so much how much time you put into your workout, but how hard you actually workout. Good luck!