You know when you're getting older...

When you can't easily sit on the ground and perform maintenance on your lawn tractor, or (truer still) bend over while riding said tractor as you mow your yard, and as you slowly ride past, bend over off the seat to pick up a small fallen limb so it would not get cut up by the mower blades on your next pass. When you do something like that, PING, muscle pull. I know this to be true, as I sit here typing this, leaning on the edge of my chair to keep my lower back pulled muscle happy.