Sanding remains the same

This is what I'm doing a lot of these days.  I'm using the neumatically driven Hutchins sander.  I sand for about 4 minutes until the compressor runs down on air, go back in the house for awhile then come back after the compressor tank is full again then repeat the process....I'm going back and forth between the garage tent and the house so much I've gotta be losing weight with all the calories i must be burning.