Wow....39....good for you.
When a bunch of us turned 40, we decided to have a get together, and play a game of touch. Now, when we were in our teens, touch meant playing on a paved lot, and imvolved tackling, diving for passes, etc. It wasn't unuusal to emerge from such a game, bleeding, arms and legs sporting parking lot rash, etc.... But when you're 15-16-17, that was no big deal. You went out and did it again after supper, or the next day.
Well, long story short, everyone was hurting after that 40+ game, despite playing on a "soft" lawn. I thought I was in good shape, and I had to call in sick the next day...lol. What sucked was discovering that my throwing arm was history. I threw it out within a few long passes.
Growing old sucks....