Attractive (although really muscular) female bodybuilder shows her exercise. At about 9:45 she decides to prove her abds are really strong, grabs some bar above her head, hangs from it and encourages the other female to punch her stomach. She does it, but with a light punches and the bodybuilder is smiling, then giggling. It lasts for about a minute (with breaks) and she is giggling and smiling all the time. You can think the situation just amuses her, but at 10:41 she finally admits "That tickles me!". The first part of the video is this Amazonian chick working out.
youtube.com/watch?v=nNCOkzLYr5I
youtube.com/watch?v=nNCOkzLYr5I