This kicked my butt today. (It looks so easy on the video.) The last 30 seconds of elevated pushups turned into just 5 followed by me jogging away with my tail between my legs. The knee was also a problem. The strides were preceded by some limp-jogging to get things in a groove before the strides. I'm not so great at the starting and stopping.
Oh, well. We have to crawl before we run.