I often do. I read (somewhere) that you should bite off more than you can chew in order to find out you can chew it. Not find out IF you can. I consistently do that. Over the weekend I did it again on the Powerchange training I ran in London, deliberately taking myself out of my depth – and out of one or two other peoples’ depth too. Result? We learned better how to swim. The longer term results will be SO worthwhile. If you do that too, I’m interested. Let me know.