What it is
Training produces different sensations, and they call for different responses:
- Effort and loading: the work of a muscle against resistance. Normal, and the point.
- Exertion: how hard the whole body is working.
- Soreness: the delayed ache a day or two after unfamiliar work. Common, and usually fades.
- Pain: an experience, not a measurement. The International Association for the Study of Pain distinguishes pain from nociception, the nervous system’s detection of possible harm, and doesn’t treat pain intensity as a measure of damage.
A label helps you describe what you feel. Its location, sharpness or timing can’t diagnose tissue damage on its own.
How it shows up for me
I used to have neat rules for my lower back: this kind of pain means stop, that kind means push. They were more confident than the evidence. Now I log what I feel, change one thing at a time, and see a professional when something sharp or persistent doesn’t settle.