Old man Jay with beat up knee routine:
Stationary bicycle for 15 minutes with light to moderate resistance.
Calf stretches, holding stretch for 30 seconds with three sets.
Leg press 15 reps X 3 @ 90 lbs. superset with calf leg press calf raises, also 15 X 3 @ 90 lbs.
Seated leg curls 15 X 3 @ 45 lbs. In between sets I grab the lever and force my knee to reach lockout for 30 seconds
Although this probably seems like doing nothing at all. My leg is feeling it somewhat. But on the plus side, each day my leg feels marginally better too.
Tomorrow I will ride the stationary bike and do the stretches, but no exercises until Friday when I have physical therapy again.