More Difficult Hill Repeats

Today was the 4th set of Hill repeats with the team, and was (imo) one of the harder ones: 45,60,75,90,75,60,45 - for a total of 7:30. I think this workout is tough because of the shape of the hill - it flattens out at the top. As a result, the 75 and 90 second repeats aren't as difficult as they would seem. It didn't help that it was hot out. I feel a little sick now (a few hours later) - and have to give a scientific presentation in about 30 minutes - hopefully I'll make it through without getting sick.