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I'm training for the VLM and using the Garmin sub-3.00 program. I first ran the VLM in 2010 using the sub-3.30 program and acheived 3:16:45. I don't recall struggling with the shorter distance, fast-paced runs back then. I between then and now, 90% of my running would have been brisk but comfortable 5M runs at c 7.15 minute miles.
I feel fit and healthy and I am hitting the top pace threshold for all my distances (very comfortably on the LSRs) but on the fast runs (eg. 8 x 800m at 6 min mile or 6M at 6.25 min miles) I just can't keep up the pace.
The wierd thing is that my HR doesn't get above 160bpm (I'm just about to hit the big 4-0 ) even though I feel completely out of steam and just can't push any faster. As a comparison, last Saturday I ran 16M at 7.30 minute miles and my HR was a steady 150bpm. I feel so motivated before the session and yet shortly after hitting the target pace I just know that I won't be able to keep it up and I gradually get slower and slower.
Could it be a fueling problem or a core fitness issue? I track all my training on Strava and always analyse my training runs afterwards and it just seems like I can't sustain anything faster than 6.45 minute miles for much longer than a few miles.
Either way I am going to keep with this training plan as all the other training runs I am bang on target. I've got a 10k to acheive this weekend at sub-6.30 min miles so I'd love to get that in the bag not least so that mentally I can get a bit of confidence back.
Any thoughts welcome.....Thx.
Maybe I'm just getting old...