The endless walk

I need to walk off some fat, but it’s either too hot outside or it’s raining.
And I’m too cheap to go to the gym.
So I bought a treadmill desk for home.
I could put a television on it to watch while walking.
The problem is, it’s old TV, and the picture quality on the Amazon Fire Stick sucks.
And I stopped using it.
So, I got a new smart TV with a network connection.
Great picture, reliable connection.
It works well. Too well.
Now, I can’t stop watching and walking.
And my knees are in bloody, gory agony.