Trying to lose weight through increased activity alone is tough to do. To lose a pound in a week’s time – strictly through exercise – you’d need to burn up an extra 500 calories a day, above and beyond your current activity level.  That’s no small task.  You’d need to hike uphill for an hour with a 10-pound backpack or swim laps for 90 minutes – without stopping. Trying to lose weight only through increased activity – or only by cutting your calories – won’t be nearly as effective as a combination of diet and exercise.

Cutting calories may cause your metabolic rate to drop somewhat. Your metabolic rate represents the number of calories your body burns just to keep basic processes going  – and is a big part of your ‘calories out’.  But your metabolic rate can dip a little when you cut back on your eating.  So even though your ‘calories in’ may be lower, your ‘calories out’ can drop, too – and leave you more or less in calorie balance.

When people think ‘exercise’, they usually think aerobic /cardio exercise, like biking, swimming or jogging.  But strength training is important, too – in part because it helps to build lean body mass, which can bump up your metabolic rate and help offset the drop in calorie burn that takes place when you cut your calories.

Full Article on Cardio vs Strength Training To Lose Weight