I'm a 42 year old fat bloke planning to start the C5k next week and I'm off to buy some running trainers this friday but I'm worried I may have to ask for a pair with specific support. I find if I walk to the shops ( around 1/2 mile away on flat pavements ) by the time I get there my achillies tendons really start to ache. I work all day on my feet and don't really have any problems. I've read different trainers give different support so should I be looking for anything in particular or should I just tough it out? Hope someone can shed some light for me