Hey dudes,

So this weekend I had my first sprint tri of the year. I don't do much swim training but as an ex national swimmer I can always hold my own there so was happy enough with an easy 5 min 400m pool swim. The bike I hadn't been looking forward to having been low on miles for the last couple of years but actually had a really good enjoyable ride, kept hr down and didn't overcook it.

Then came the run. I've been on about 20-30mpw with the run over the last 9-10 weeks so I was looking forward to having a go at a new 5k pb. It was an out and back with the first half a gentle downhill, then gentle uphill on the way back. Around half way I got the worst shin cramps I've ever had, could barely even walk! I ended up limping home on the run in agony!

So, I'm wondering what the cause could have been? I've done lots of runs in those shoes before although this year most of my runs have been in different shoes, so maybe that? Also wondering if it could be anything to do with bike fit? Definitely wasn't hydration/feeling!

Any thoughts much appreciated!