I wish it had started hurting immediately, so I would know which stupid thing to never ever do again, but it waited for an hour or two instead. Grr.
Things this has taught me instead of how not to lift: You can have a surprising amount of fun lying flat on your back on top of a bag of frozen peas, but the peas will thaw. Frozen spinach thaws faster than frozen peas. I am apparently immune to menthol; the Icy Hot, it does nothing. Walking is better than sitting; lying down is kind of intermediate. Unless there are peas.