I seem to have done two very similar sessions to yous Stevie this week. Tuesday was 20 x 1 min off 30 seconds recovery. It absolutely killed me. Up and down the sweeping 'u' shape of the industrial estate so some downhills came out at 4.30 pace and the up hills were 5.50 pace towards the end. All of it felt ridiculously painful.
I ended up having Wednesday off due to fitting some fancy fibre optic ceiling light. I spent 4 hours kneeling on the joists in my loft, curled up in a ball and after 4 hours my hamstrings and knees were in bits.
Should've bloody gone running instead!!
Tonight's session was 1000 (3.10)- 800 (2.28) - 600 (1.50) - 400 (72) all off 45 seconds. We then had a couple of minutes stretching and repeated the session but with 90 secs recovery. I was told before the session that the second lot should be quicker as the recoveries were longer but I wasn't so sure they would be.
All of them ended up being the 1000 came out at 3.06 with the 800 and 600 being a couple of seconds quicker and everyone had a blast at the 400 which ended up at 64. :-/
One lad sets off 15 - 20 metres in front of me on pretty much every rep. this is so all abilities finish around the same time. It's up to each runner to gauge where they set off from. He then blasts a 60 sec 400 to finish with. I can never understand why he doesn't want to push himself harder on the longer reps because he flies at the 400s. You only get out what you put in.