For the most part, I get weaker, but if I really REALLY don't want to be tickled (like the person doing the tickling is a creep) I sometimes get stronger.
Weaker! Especially if the ler is holding me down and I'm expending as much energy fighting them off as laughing, in about ten seconds I just give up exhausted and let them have their way. lolz.
I feel weaker from laughing for a long time and losing oxygen but I also feel stronger at the same time from the rush that I get...I feel that effect more after being tickled.
I get all this random adrenaline coursing through my system, and get much stronger. I have been known to fling people off me. This is why i prefer to be tied down.
AT the start im a fighting monster. The longer it goes the weaker I get to the point I have no energy left but to lay there and laugh my ass off. Unless of course the times where my feet are the targets , there is no bondage but im ordered to remain still OR ELSE!...now THERE'S a challenge