Just a gym session today

Again I did a training session whilst at work today (about 3.30 pm). This time it was only in the gym and I concentrated solely on my abs for about 30 mins. I did have my running gear with me but leading up to 3 and 3.30 pm I was feeling a little light-headed. All this week whilst at work I've felt more tired than usual and I''m hoping this is just 'first week back at work' blues. I also have a feeling that maybe I should be sleeping more or getting to bed earlier. Well with a light-headed feeling I thought to myself, "self - today is not a day to go for a run" and I didn't. In this instance I was listening to my body. Most of my gym sessions revolve around exercises for my abs. After most runs I try and at least get in 200 sit-ups. I've been doing this now for about 3 months and I'm sure this is why I have started to lose a little weight and trim up around the stomach. Weight this morning was 77.9 kg. I reckon 75 kg is an achievable target and when reached will re-assess my weight situation. I'm wondering how much faster could I run if I was 2 or 3 kg lighter. There must be some sort of rule of thumb calculation. Plan for tomorrow 15 k'er getting on the Yarra from Anderson St, up the Yarra to Flinders St, cross the bridge and back along the Yarra to a few km's past Grange Rd, return back to the office. I'll do this one after work. Well that's the plan. I'll even try out some of my home-made energy gel. Until next time...