We've decided to let him romp like usual (within reason) for the rest of this spring and summer. He and his sister have been making the most of it! You should see them play like maniacs during our evening hikes.
To train both dogs during one session, I first had to teach the two of them that whoever was not being trained had to hold a quiet "down-stay" while I worked with the other dog. At first, that was tough for each of them. But now they're pros at that part of our training routine.
I spend about 20 minutes per day working with them. With R, I first focused on a couple of tricks that I thought would help his elbow and shoulder range of motion. He learned to wave with each paw, depending on which one I asked for. He also re-learned how to take a bow, which stretches his elbow and shoulder muscles and tendons.
Here's to an amazing dog!