I'm running 5 minute repeats on a track, with a rest after each one of a minute, and I've been told to run them consistently, rather than going out fast on the first one and then getting increasingly slow over time.
If I'm aiming for 1:38 per lap of the track, what counts as 'consistent'? I suppose ideally you'd do every single lap at exactly 1:38, but that seems impossible (if nothing else, from inconsistent timing).
So how close should each lap be to the ideal lap time? Is within 1 second good enough, or should I be more stringent?
Here's a graph of the last two times I did this; the first time is less consistent than the second (well, I did get consistently slower quicker the first time I attempted this) but I'm not sure where I should be aiming to tighten things up - when does it appear I stopped being consistent enough on the second attempt?