Just done today's run and ouch!! Funnily enough, the 5 min runs were ok, but the 3 min ones were really tough. Back on my normal route, so no surprise gradients, but for some reason the 1st and 3rd runs really got to me. Had to give myself a big mental kick to even keep going during the first 3min. V. odd, but at least I didn't stop. You win some and you lose some I guess.