When women do certain types of arm exercises that involve stretching the muscle while contracting it, they tend to feel more soreness and their muscles get thicker — probably because of inflammation...

People feel less sore after doing the same tough arm workout a second time, four weeks later.

Doing a new type of strength exercise that stretches your biceps a lot can cause temporary muscle damage and soreness in women, and these effects can last up to four days.

Doing certain types of hard arm exercises that lengthen the muscle while it's working can make your arms weaker and less flexible within a day.

When people who don't exercise regularly try a new type of strength workout that focuses on lengthening muscles, their upper body and back muscles get much weaker and more sore than their leg muscles. This shows that different parts of the body are more sensitive to the stress of unfamiliar exercise.