The mrs did hers while running. Nothing unusual in that she runs a fair bit but this time she went a bit further than usual after a week off.
Mentioned that it was ‘obtrusive’ when she got back and within a few hours it was inflamed & obv something was wrong. Used ice and rest for a while and tried some gentle stretches after a few days but this one couldn’t be teased out.
Professional advice suggested high arches and a very heel-heavy walk/run
Probably 6 months or so before it was properly ‘right’ and it’s been ok since she started running on her toes instead of her heels.