I find the fact that a few days off from running can essentially set you back to square one, well at least for me anyways. What I do find most interesting is that my pace/speed does not go down, but my ability to go the same distance is drastically severed. 

I took a three day break from serious running, (about 4-5 miles a day) and find myself completing a measly 2.66 mile run today and feeling extremely exhausted. It’s as if my lungs and body would just not go any further, but still, my pace @ 7:01 was not harmed, just how long my body could sustain such a pace. Interesting, does anyone else notice this?

I’d be pleased if anyone knew why this was, and if it is merely me, but I’m sure it’s not. Why does this happen?