Ok si I'm still working on a schedule but I liked @speCulatius 'suggestion to work on a 10 day schedule. And instead of fitting 3 badminton sessions a week, I'd fit 3 every 10 days. Obviously each session should be more meaningful with specific areas to work on and played wholeheartedly. No more social games or fun sessions at my local club (I would only play at 1 club, the more competitive one instead of 2). As for triathlon I would focus on interval almost exclusively with only 1 session of full sprint distance every 10 days for running and cycling. Other sessions should be based on intervals (running and cycling) coupled with strength training. I'm wondering if I would become a better badminton player by playing less but improving my physical condition (supposedly). I started a little program this monday and will think about it and try a few things, mostly based on what you guys recommended and see what works for me.