Best click the kettle on- this is a long one!
Bit of background: I graduated C25K on Christmas Eve 2016, and was running 5km 2-3 times a week after that up until I moved house in September 2017, where a change in circumstances meant running was out the window. As a new year's resolution for 2019, I'm VERY slowly getting back to 'running' (once or twice a week, running for 30 minutes but at my current speed that's only 4 and a bit km a time).
All of the above has been done in the same pair of shoes- a pair of "New Balance 680v3" trainers I picked up cheap in Sports Direct on the basis of "these feel comfy, are cheap, and are not a hideous colour". They're starting to suffer a bit of cosmetic damage in the form of wear/scuff marks, but given I use a treadmill it's not an issue- or so I thought.
I was killing time in a running shop yesterday waiting for a friend and apparently running shoes are only supposed to last 6 months? This has led to the following questions which I'd really like some help on:
1) Is this true, or was this just a salesperson trying to make a sale?
2) How do you know/how did you know it was time to replace your shoes?
3) Gait analysis- is it worth it? The shop I wandered into does it for free if you buy shoes from them, or should I just buy another pair of what I've got off the internet?
4) Does anyone else find their knees knock together on the odd occasion when they run? It's something that's started to happen every now and then recently, but the salesperson said it could be either my shoes, or my legs not being toned enough to cope with running?
If anyone can help at all with any of the above I'd be really grateful- I'm absolutely clueless about shoes!
Thank you in advance