The line between taking it too easy after an illness or injury and rushing your recovery is a fine one. But as long as you’re careful about your training, there is almost always something you can do to stay active.
Fitness Q & A
If calorie burn is your priority, and especially if you're pressed for time (which pretty much includes everyone), you want to get as much mileage out of your workouts as possible. That means exercising smarter and harder, but it doesn't always have to mean longer workouts.