Panel 1: We start things off with Mike asking John if he wants to play some ball. Since he has back pain issues that both he and his creator don't really address, John says "Later, okay?"
Panel 2: We see the first example of Lynn having no real idea what a bike helmet (or, for that matter, any other sort of saefty gear) looks like when Elizabeth comes in with helmet drawn from imperfect, distorted memory and asks him if he wants to go on a bike ride with her. He says "Not now, Liz."
Panel 3: Since he would have been up for that if he weren't about to be compelled to buy a toy so that Lynn can mock Rod for an affectation she finds silly, he wonders what's the matter with him. He has no stamina, no enthusiasm and feels as if the weight of the world is on his shoulders.
Panel 4: As he looks down at the bathroom scale, he speculates that this is the reason he weighs so much.
Summary: We end the week with another joke about the bathroom scale that goes nowhere much. Next week though, we get to start calling him Train Man again.