I'm starting doing walking competitions and my current Adidas shoes really hurt my feet and shins... I want to get new shoes but no sales person seems to know what I need. Who can I see to get advice about the correct walking shoes, or which shop can I go to... All the typical places (Totalsports, Sportmans Warehouse) etc have sales reps that are only interested in selling the most expensive shoe to earn more commission... Please help...