chubby's speed workouts

I feel getting chubby now, the purpose is pretty simple since I can't stop eating a lot of foods as same in the hard marathon season without any hard session.

On Wednesday night, I felt so hard to finish for only 4 times of 1,200 meters hardish intervals.
I am not in the mood for serious running, so it's kind of impossible to measure my maximum HR as my coach wants to know. He looks like a devil sometimes and then one of TTOG is so sweet. That's a wondering thing, they might achieve a balance, maybe.

wednesday's efforts:
time: 1h24m23s
800m warm up:
time: 3:21 avg HR: 77-157% avg pace: 4:22/km mil: 800m
1,200m intervals:
1st session time: 4:45 avg HR: 86%-174 avg pace: 4:07/km
2nd session time: 4:52 avg HR: 89%-181 avg pace: 4:11/km
3rd session time: 4:56 avg HR: 90%-183 avg pace: 4:21/km
4th session time: 5:10 avg HR: 88%-179 avg pace: 4:25/km
cool dowm
time: 1:38 avg HR: 78%-158 avg pace: 4:24/km mil: 400m

avg HR: 73%-149 avg pace: 6:01/km
mile: 14km cal: 618kcal
location: yoyogi park and the track
beginning time: 18:52pm