Why it matters
Running shoes are your primary point of contact with the ground on every single step. Worn-out cushioning or the wrong shoe for your gait is a commonly cited factor in general running-injury prevention guidance.
When to think about replacing them
A commonly cited rough guideline is somewhere in the range of 300-500 miles, though this varies a lot by shoe, running surface, and body weight. Visible wear on the outsole or midsole, or shoes that just don't feel as supportive as they used to, are also reasonable signals.
What actually varies between shoes
Cushioning level, drop (the height difference between heel and forefoot), and stability features all vary. What works well for one runner's gait won't necessarily suit another's — this is genuinely individual.
How people typically approach it
A specialty running store can often do a basic gait assessment and point you toward a few reasonable options. If you're dealing with recurring pain, that's a conversation for a physical therapist or sports medicine professional, not a shoe swap alone.
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