You may see someone dripping in sweat after their workout and may think, wow, they must have burned a ton of calories! Sweating isn't an indicator of a good workout. Sweating is simply your body's way of cooling itself. You can still burn a good amount of calories without sweating profusely. Light activities like a brisk walk will still burn calories and help maintain fitness.

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Did you know that short but intense interval training has been proven more effective than much longer durations of low intensity work? I have more advice from research and personal experience at http://www.workoutreview.blogspot.com
Related to this (and you may have mentioned it elsewhere) is the myth that if you ache after lifting weights, it means you’ve had a good workout.
In reality, the ache means that you have been working muscles in a way they are not used to and doesn’t have a bearing on how hard you worked.