Personally I prefer elliptical. I have on occasion gone 2 hours on them (Level 5, approx 130-140 rpm). This "calculates" at about 1400 cal. On a treadmill I can only do approx 2km (13-14 minutes, mix of jog (11.5kmph or approx 7.1 mph) )and quick walk to recover (approx 4mph / 6.5 kmph)))). I could walk for hours on it at a slower pace but it doesnt seem the same.
I would agree with previous posters and say mix it up a bit. some days I do rowing machine 15 mins, cross trainer anywhere to two hours, treadmill 13-15 minutes, exercise bike 15-30 mins (the one you sit back into is rather comfortable!!). Other days its just some cardio (Approx an hour), and all the resistance machines for muscle toning (Approx an hour). Also an ipod also really helps, even if you are not a massive music lover, you find yourself not thinking about the exercise and listening to songs instead, and then you think "I'll listen to the next song" and it keeps going on. (Ipods plug straight into the cardio equipment in the gym I go to, and records the workout too, so I can see what day how much I did, calories burnt etc and it keeps a record - Technogym equipment). My own personal thinking is that when you are bored, psychologically and you feel more tired physically and less energetic. so if you can avoid this boredom, you feel better, more energetic and go for longer.
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