It's always so hard

So since I verbally commited to doing the Pasadena Half (maybe full but doubt it) Marathon, I guess I'd better train.

Tonight-Speedwork. I HATE speedwork, so I guess I'd better suck it up and do it.
8 x 400M 90 second recovery @ 2:15 target.

Lap 1-1:55 (yeah)
Lap 2-1:56 (cool-and still no pain in my knee)
Lap 3-2:06 (still ok)
Lap 4: 2:05 (starting to feel tired)
Lap 5: 2:10 (WHAT?!?)
Lap 6: 2:12 (this is starting to suck)
Lap 7: 2:13 (OK now I'm sucking wind)
Lap 8: 2:16 (Thank god it's over!!)

Oh-I just re-looked at the pace chart. At a 2:15 target, that would give me a 4:54 marathon, 5K race-30 minutes. I've been trying for a sub-30 5K so I better move my pace target to 2:10. I've been close, but have not been able to break that sub-30 5K. Looking at my lap times, I was able to do the first 5 laps at that pace. It's the last 3 when I get tired that I can't sustain that pace. Gotta work on that. Gotta increase the cardio. Can I blame the slower pace on the 175 situps and 140 burpees I did yesterday? HMMM maybe not. That's just an excuse I guess.

Is it in my nature to be a slacker?

So it was the second night in a row for bootcamp. Boy I'm tired.
100 situps
run over to 100 burpees
run back to 75 situps
run to 75 burpees (only completed 40). Was glad to get over half done before time was called.

Tonight is tempo work...getting ready for Pasadena.

So is there a body type that wasnt' built for running? I sure feel like I'm one of them. When things start to get good, I get injured. Is this all in my head? By body tells me no. But I can't build up my cardio to do any better. According to Malkovich in Dangerous Liasons, maybe its not in my nature. Of course he does die in the end, of his own accord. Can't loose the extra weight. Can't increase my cardio. Can't Can't Can't. It's all in my head, right? I should be thinking what can I do to..... BUT Is it in my nature?