Isn't this the idea behind Crossfit? I was always surprised the workouts were actually quite short maybe 10-15 minutes total of movement. Yet strangely I was losing weight and toning up fast. From one week to the next.

Even in a real gym -- if we subtract out all the time we spend changing our clothes, looking at our phones, talking to our friends, resting between sets, drinking water -- it only adds up to about 5-10 minutes of real exercise.