~ ADDENDUM ~
I ran hard on the TM for 30 minutes after work. Later, after a sandwich at home, I did 20 x 4 "kettlebell" swings with a 25-lb weight. I'm not sure I did them properly because a weight is harder to hold between the legs than a k-bell which has that handy, er, handle at the top. I concentrated on keeping a straight back and my shoulders above my knees. I'm not sure how successful I was on that last point. Next time I'll try it in front of a mirror.
The run was no biggie but the swings left me breathless. I had to rest at least a minute between sets. I'm encouraged to find one or two kettle bells and some new exercises.