AltShift PDF Free Download. Jason Seib is the creator of AltShift Diet and co-author of The JASSA Method, co-host of the popular JASSA Podcast, co-founder and co-owner of Clackamas Physical Conditioning, a successful small gym in the Portland, Oregon area, as well as co-founder and co-owner of JassaFIT.com, an online training site and community. He speaks on the subject of fat loss regularly, delivering his Sustainable Fat Loss Seminar around the US. Jason’s passion is guiding normal people to extraordinary levels of health and fitness and he has built his career by helping thousands of people to change their perspective and find a healthy, sustainable path to their goals.. AltShift PDF Free Download