Whenever I am tickled for longer than 15 minutes I know I am getting a good workout. I squirm and struggle a lot and tend to breath really heavy, moan, and scream. This has mainly been done with me restrained with cuffs or rope bondage. Often if I am tickeled for an hour or more then I am really sweaty and exausted by the end of it ( and totally high off the endorphins). Did I mention how much I love this!!!
my 2 cents,
Faith