Yeah, I'm pretty sure that Shannon Sharpe was doing a lot more than one hour per day of training when he was playing competitively. It's my observation that two workouts or practices per day is typical for collegiate athletics, even in the sports and at the schools that don't bring in money.
But after that? Yeah, no doubt that one can maintain most of that fitness with a small fraction of the time and effort.
As I said up-thread, I started running as an Army cadet, and I've continued to take annual fitness tests throughout my career. The fastest guys on those tests are guys who (unsurprisingly) were serious runners or soccer players in high school / college but who (surprisingly) did very little running after that. They could jump into the test cold and laugh their way to two miles in 12:00 (11:00 if they were really trying). I, on the other hand, basically didn't start running until I joined the Army, and I had to put in a lot of miles to break 13:00. For several years after that, though, I was able to reduce my mileage too and still run circles around a lot of people.
But after that? Yeah, no doubt that one can maintain most of that fitness with a small fraction of the time and effort.
As I said up-thread, I started running as an Army cadet, and I've continued to take annual fitness tests throughout my career. The fastest guys on those tests are guys who (unsurprisingly) were serious runners or soccer players in high school / college but who (surprisingly) did very little running after that. They could jump into the test cold and laugh their way to two miles in 12:00 (11:00 if they were really trying). I, on the other hand, basically didn't start running until I joined the Army, and I had to put in a lot of miles to break 13:00. For several years after that, though, I was able to reduce my mileage too and still run circles around a lot of people.