Am I the only one in finding interval training really tough?
I have been doing 6x400m runs and also 5x3min runs as part of a Runkeeper training course and it has been lungs-on-fire brutal especially because the intention is to run these fast,i.e. sprint.
I can't work out whether it is better to run as fast as possible at the start of each interval no matter how slow I end up at the end or to just set a fast pace, above normal running speed, which I try to maintain over the distance/time.....
Can someone please tell me that it is all worth it?!