Scenario: after years at the same weight, you find yourself creeping up in weight, gaining a couple pounds or so each year - even though your diet and activity level haven't changed.
Your internal "thermostat" is doing its job of regulating your appetite and controlling your weight. Most likely the problem is you're losing muscle, especially if you don't train with weights. When you lose muscle, which starts happening in your 20's and 30's, your fat cells expand to fill up the space.
In this case, you don't need hardcore exercise. You just need to move more. Take the stairs. Walk whenever you can (separate from your workout). Bike. Yard work. Housework. Chores.
Now, if you REALLY want to keep off those pounds of fat from haunting you, start, or get back to, strength training. Muscle increases your metabolism, thereby burning more calories. 20-30 minutes of moderate strength training 3-6 days a week, high reps and low weight.
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