Effect of sand versus grass training

I have always been of the view that training on sand was not the best thing.. that because it was soft it loaded the Achilles more, and because there was a slope (so the sea can run out), this was also not ideal.. I think, however, I am changing my mind... read on!

Dr Andy Franklyn-Miller (who's website you really should check out) has drawn my attention to a very recent paper entilted: