Sub-3 means 4:16 per kilometre, 6:52 per mile, held for 42.2 with no fade. That leaves no room for guesswork in your paces, your marathon-pace volume, or an honest read on whether you are on track. Vertical works from your real data, not a target you wish you had.
The gap
A downloadable sub-3 plan gives you a grid of paces built for an imaginary runner already fit enough to break three hours. It cannot see your current threshold, your recent long runs, or the gap between where you are and 4:16 per kilometre. So it prescribes marathon-pace work you may not be ready to absorb, or leaves you guessing whether the target is real at all.
Breaking three hours is a demanding goal that rewards precision and punishes wishful thinking. You need paces derived from your actual fitness, marathon-pace long runs that build specific endurance, threshold volume that lifts your ceiling, and a coach willing to tell you plainly when the trajectory says sub-3 and when it says not yet.
How Vertical coaches your sub-3 attempt
Vertical derives your marathon, threshold, and easy paces from your own runs or a recent race. Every session runs at a number your current fitness supports, so the work carries you toward 4:16 per kilometre without burying you.
Sub-3 is won by holding goal pace when tired. Vertical structures long runs with progressive blocks at marathon effort, so your legs learn 4:16 per kilometre in a fatigued state, which is exactly the demand of the final 10k.
Raising your threshold is what makes marathon pace feel controlled. Vertical periodises your threshold and interval work on the back of more than 500 peer-reviewed studies, so the hard sessions land with purpose and recovery is protected.
Vertical tracks your training against the demands of sub-3 and tells you straight where you stand. If your trajectory supports it, you will know. If it does not yet, you get a clear picture of what has to change and no false comfort.
The short version
Your threshold session came in at 3:58/km for 6k, right on the number we set from your recent half. To hold 4:16/km for the full 42.2, your next long run adds a 16k block at marathon pace inside a 32k run. Nail that and sub-3 stays a realistic target on your current trajectory.
In practice
Your goal pace is 4:16 per kilometre. Vertical builds it into long runs as fatigued blocks, then reads how you held it and how you recovered, tightening the next session until goal pace stops feeling like a fight.
Your threshold run comes in slower than the target. Tell Vertical it felt flat, and it weighs whether that was fatigue, a bad day, or a sign to adjust. It then reshapes the week to protect the block that matters, no blind repeat of the same number.
Six weeks out you want the truth. Vertical compares your marathon-pace volume, threshold, and long-run execution against what sub-3 demands and tells you where you stand, so you commit to 2:59 or reset the goal with eyes open.
How it works
Connect a Garmin, COROS, Polar, or Suunto watch, or enter a recent race. In about two minutes Vertical reads your fitness and gives an honest first take on how far you sit from three-hour shape. No card required.
Vertical sets your marathon, threshold, and easy paces from your real fitness and builds a periodised block toward race day, with marathon-pace long runs and threshold volume placed where they do the most good.
Run your sessions, then tell Vertical how they went by chat or voice. It reads your splits and your feedback, adjusts paces as your fitness moves, and keeps the hard days sharp and the easy days honest.
As race day nears, Vertical gives you a clear read on whether sub-3 is on. You line up knowing your pace plan is built on your real trajectory.
That is the first thing the free assessment addresses. Vertical reads your current fitness and gives an honest take on how far you sit from three-hour shape. Sub-3 is a demanding target that assumes a solid training base, and Vertical will tell you plainly whether your trajectory supports it or what needs to change first.
Breaking three hours means averaging 4:16 per kilometre, or 6:52 per mile, for the full 42.2 with no fade. You can sanity-check goal and training paces with the free training pace calculator, and Vertical sets your working paces from your real data rather than the target alone.
Enough to make 4:16 per kilometre feel controlled when you are tired. Vertical builds progressive marathon-pace blocks into your long runs and adjusts the volume as your fitness responds, since holding goal pace late in the race is what decides a sub-3.
Yes. Sub-3 rewards runners who arrive with real weekly volume and a history of consistent training. If your base is not there yet, Vertical will say so and focus on building it safely before layering in the sharpest sub-3 work.
A static plan prescribes paces for an imaginary runner and never checks whether you can absorb them. Vertical derives every pace from your own data, adapts when a key session underperforms or life interrupts, and gives you an ongoing readiness read in place of a fixed grid.
Yes. The assessment is free and needs no card. You get an honest read on your fitness and your gap to three-hour shape first. A 7-day trial unlocks the full plan and daily coaching if you want to commit to the build.
Get started
Start with a free assessment. It takes about two minutes, reads your real fitness, and gives you an honest verdict on how close you are to three-hour shape before you commit. No card required.
Free · About 2 minutes · Trusted by 200+ athletes