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 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 and fluid buildup.

Doing super-slow, lengthening muscle exercises (like lowering a heavy weight) causes more muscle damage than shortening ones, and you can see it on an ultrasound of your arm muscles.

Some guys who do really intense bicep exercises can lose almost all their strength right after and take over a month and a half to fully recover — way longer than usual.

Over an 8-week training program targeting the elbow flexors, untrained females performed more total resistance exercise volume than untrained males, but both groups showed similar increases in muscle thickness and strength.