My penny's worth: Distance mileage (i.e. 100 miles/week) is not seen as beneficial these days - Liz McColgan is an example of that type of training, she now has basically a prosthetic toe from all the damage of high mileage (albeit that was probably high intensity) and can't run.
Annie Emmerson raced at the World Half Marathon champs when she was swimming more than ever.
Power to weight ratio plus increasing aerobic fitness with reduced weight bearing - unless you have a perfect physique/balance - has got to be the way forward.
Just MHO.
