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Personally, id go for a recovery run just to see if it reacts, before I start pulling the body about in ways it isn't used to.
Muss, yes a lot of these simple exercises, if done properly are pretty hard. Take a glute bridge repeats. When I had physio in the Spring she got me doing these and I was smashing them out with ease. When I then demonstrated it to the physio she made a few tweaks to my angles and it suddenly became pretty hard to do half the volume I was doing.
Session went well today. First 5k in 19.46 with 6.24, 6.18 and 6.19 and some extra bits.
3 mins rest before next harder 5k. Went off like it was a parkrun and reigned it in as best I could for 5.54, then 6.01 then 6.00 then 5.50 for the scraps for 18.31. My parkrun pb is 18.20 but on a course that has changed now as it was short. On a course measuring 5k my pb is 18.37 so a casual pb on the streets following a steady 5k.
Pleased with that but I must caveat it that at about 1.8m I had to cross a very busy road and got stuck and so stopped my watch whilst waiting and had a little rest as a result. My elapsed time was 18.55, which frankly i'd have been happy with anyway. This wasn't a TT, just a hard tempo, following a steady one.