There's no single exercise that is "best." Different kinds of exercise accomplish differnent things. Cardio is good for cardio-vascular endurance and burning fat, but strength training is good for building strength and getting that toned and firm look that it sounds like you are after. So you want to be doing both. And, as Nelie says, muscle burns more calories than fat, even when you are just sitting on the sofa, so building muscle also helps with burning fat.
If you do the same thing every day, your body becomes more efficient at it and it isn't as effective. So the best exercise is, well, everything. Your exercise routine should include as much variety as you can manage. Some strength training, some biking, some walking, other cardio (such as swimming, hiking, running, dancing, kick-boxing, other cardio machines if they are available to you, jumping rope, etc.--there are lots of things you can do). And sports, like tennis, are good too. And yoga and pilates. Variety also helps keep you from getting bored and prevents over-use injuries.
Last edited by BlueToBlue; 02-22-2009 at 03:54 PM.
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