Pat discusses 4 simple and straightforward principles for increasing lean muscle mass. 4 Simple Rules for Building LEAN Muscle New eBook: Introduction to Kettlebells – Just $1 on Amazon! Recently, I wrote a short (read: 30 pages) eBook called Introduction to Kettlebells, which is now available on Amazon for a whopping — brace yourself! — … Continue reading EP 433: 4 Simple Rules for Building LEAN Muscle