A teenage girl should be able to do an average of 29-32 curl ups in a minute. Less than 29 curl ups in 60 seconds is considered poor while more than 32 curl ups in that duration is considered above average for a teenage girl.
Abdominal muscles
A curl-up on a stable surface, rectus abdominis muscle activity was 21% of MVC and external oblique muscle activity was 5% of MVC.
The abdominal region has little bony protection, and is susceptible to external injury.
Hamstring - Semimembraneous
A sit up or curl up test measures the muscular strength and endurance of the abdominals and hip-flexors. Do as many sit ups in one minute.
There are no bones protecting the vital organs in the abdominal cavity. We instinctively curl over our abdominal area to protect these organs from injury when there is danger.
Curl-ups are abdominal exercises performed to strengthen the called the rectus abdominis muscle. This exercise also helps to tone your midsection. To perform a curl-up, you lie on your back with knees bent and the feet flat on the floor. Place your hands behind the head and tuck the chin to the chest. Curl the head, shoulders, and upper back off the floor. Roll back down to your starting position and repeat the movement.
The main muscle used in curls is the biceps.
Some popular brands of board-shorts for teens include Quiksilver, O'Neil, Billabong, Volcom, Hurley and Rip Curl
curl
we curl the leaves and thats the curl
You can use un-, for uncurl.