It can't be good for you...

Roadrunners last night, and another really hard session. It was touted as a "bleep test for endurance running", and it really did work out like that. We had to do 400 metre laps, with a 60 second recovery between each one. You started at your 10k pace (so a 1.38 lap for me) and then each subsequent lap had to be 2 seconds faster...