After a hard leg session, stairs can make your quads feel like the entire workout is still happening. Soreness is noticeable, but it is not a complete report on recovery—or a reliable score for how effective the session was. The more useful question is whether you can return to training and perform the work your plan calls for.
Soreness is only one signal
Delayed muscle soreness often follows unfamiliar or demanding exercise, especially when a session includes movements your body is not used to. Its intensity can vary without matching the amount of muscle growth or progress you will make. Less soreness does not automatically mean a session was ineffective, and more is not a badge to pursue.
Watch performance over time
Look at whether your working weights, repetitions, and technique are holding steady or improving across sessions. Also notice persistent fatigue, unusual drops in performance, and whether normal movement remains comfortable. One difficult workout can happen; a repeated pattern is more useful information for adjusting training.
Build recovery into the plan
Adequate sleep, enough food, and sensible spacing between hard sessions support the work you do in the gym. If soreness changes how you move, reduce the load or choose a variation that lets you train with control rather than forcing the planned session unchanged. Recovery is not a bonus day. It is part of the training picture.