If i exercise for 20 minutes then take a break...?

then continue exercising for another 20 minutes and so on will it be as effective as it would be if i just exercised for an hour straight?
Answer:
Doing your exercise in 20 minute segments is almost the same as going an hour straight. The 1 hour workout is a little more effective for cardiovascular (heart), but you want to work yourself there gradually. Slowly increase the length or your workouts until you get to that hour, without killing yourself. That will build up your endurance as well. More tips on the links below.

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Not really, you need to keep your heart rate up when exercising. If you are taking a break because your getting warn out try less strenuous exercises and shorter reps of each.

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it will still be good for your body in general for sure, but if you're trying to lose weight- then you need to try and go continuously so your heart rate stays elevated constantly. as for me, my heart rate gets up pretty quick depending on the machine or exercise, so i do take breaks in between exercises and do a few weights until i'm ready for the next machine.

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You really don't start burning fat until after 30 min. So anything under 30 min...you're getting rid of water weight. So try to do intervals of 30 mins then take a small 10 min, at the most, break then do your final 30 mins. I find it easier to do my 1 hour all together...mostly because I don't have a lot of time to rest and do other things and then motivate myself to get back into working out...I like to be done with it.

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for optimum stimulation of the metabolic rate you want to exercise non-stop at a high level of intensity for 60-80 minutes

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It takes a while to get to the point of a "good burn" where you're actually doing the most good...but...if you do it in stages with breaks, step it up a notch for 2nd workout...bodies get used to one level, even at 30 min, have to advance workout longer or in speed/weight/etc after a while to get same results

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ALL FALSE
YES split it upIT IS UNNATURAL TO CONTINUE AN ACTIVITY FOR 60 MINUTES STRAIGHTNO ANIMAL IN NATURE RUNS ON ENDTHEY GO ON/ OFF SPRINTS DIFFERENT SPEEDS SMALL BREAKS

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