Usually at supermakets, in their recycling section they have shoes collections. Running trainers might not be put to their proper use but I believe they still get sent to poorer countries.
I know this is an old tread, but if anyone still reads this please can you fill out this short survey for me. It is to do with disposing of disused trainers and your recycling habits. Here is the link https://docs.google.com/forms/d/e/1FAIpQLSdamOpvOPX6Gh6BSL_DeVpSHQWCRFPVMO77puHomp9-iU0nLQ/viewform?usp=sf_link
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also Salvation Army have clothes/shoe bins at many recycling centres - don't know where they distribute their donated stuff to though...
Thanks!