muscle pain; soreness of muscles (often occurring after exercise or heavy physical work).
昨日のランニングで太ももが筋肉痛になった。
My thighs are sore from yesterday's run.
筋肉痛は軽いストレッチで和らぐことが多い。
Muscle soreness is often eased by light stretching.
重い荷物を運んだら翌日筋肉痛になった。
After carrying heavy luggage I had sore muscles the next day.