Putrid gym towels

My towels get really putrid very quickly (after 20 minutes of rigorous cardio) at the gym. They smell like some very expensive, delicious but also putrid Camembert that my French friend once brought me. I only use clean towels and never use one twice. I use this detergent at 60º C (140º F) :

http://www.ecover.com/GB/EN/products/ProductDetails.aspx?PId=9019&VId=20019004047&CId=104&NM=Washing Powder - Non Bio - Fragrance free

Any tips?

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