Explain What Delayed Onset Muscle Soreness Actually Means for Tomorrow's Session

Yesterday's session left your legs aching and you don't know if today's plan should change. This explains what delayed onset muscle soreness actually is, how it differs from an injury, and gives you a straightforward rule for deciding whether to train through it or rest. Written for someone new to structured exercise.

Explain delayed onset muscle soreness (DOMS) to someone who trained hard yesterday and is deciding whether to train again today. Cover what causes it, how it differs from an injury, and the difference between sore but fine and sore in a way that means stop. End with a plain rule of thumb they can apply on days like this one. Keep it to two short paragraphs, plain English, no medical jargon, aimed at someone in their first year of structured exercise.