As an author, I spend a lot of time sitting at the keyboard, as do many in this and similar professions. Prior to becoming a novelist, I was a long-haul trucker, another sedentary lifestyle. Over the course of many years, the body I once had as an active-duty Marine turned into a blob.So, I decided to do something about it. The change from Marine to blob took decades, so I didn’t even notice it happening. But when I put the aging process in reverse, the changes were very noticeable...

As an author, I spend a lot of time sitting at the keyboard, as do many in my and similar professions. Prior to becoming a novelist, I was a long-haul trucker, another sedentary lifestyle. Over the course of many years, the body I once had as an active-duty Marine turned into a blob.So, I decided to do something about it. The change from Marine to blob took decades, so I didn’t even notice it happening. But when I put the aging process in reverse, the changes were very noticeable an...