Working backward from three meso cycles
Over eight months, this is how I would train for the UTA50. Not a rule book, just how I’d personally structure it, working backward from three eleven week meso cycles.
Each block runs six to eight weeks of aerobic base building, two to four weeks of intensity, and one to two weeks of deload to reset before the next block starts. Three meso cycles in total, each one building on the last.
8-month build- Aerobic base61%
- Intensity26%
- Deload13%
Before I go further, one thing needs to be said clearly. This is not a one size fits all plan. It’s what I’d do, with my history and where my body’s at right now. Your starting point, your injury history, your available time, all of that changes what the right build looks like for you. Use this as a way of thinking about structure, not a plan to copy line for line.
What the elites do, and what that means for me
Here’s the bit that made me stop and think while I was putting numbers to this. Research on elite endurance athletes, Stoggl and Sperlich’s well known review, found they train at around 80% low intensity and only about 20% moderate to high. That’s professionals, people whose entire job is recovering properly and training smart.
Look at my own numbers above. Even with generous ranges, I land somewhere around 60 to 70% low intensity across the eight months. That’s less aerobic work than the elites are doing, and I’m not a professional athlete. I’m just a dad with a business and three kids, mapping out what a fifty kilometre build would look like.
Low vs high intensity- Low intensity
- Moderate to high intensity
Why I’m using the UTA50 as the example
Just to be clear, this is a theoretical build. I’m not lining up for the 50km. I’m back for the UTA100 Mile again, the 160km. But most of the people I coach are looking at something more like a 50km, so I wanted to map the thinking out against a distance more of you can actually picture yourselves racing.
I’ve raced Ultra-Trail Australia a few times, including 16th overall in the UTA100 Mile last year (160km in 22 hours 36 minutes). The 50km with a full eight month runway felt like the right example to build this structure against.
The three meso cycles
Each eleven week block follows the same shape:
- Six to eight weeks aerobic base: high volume, low to moderate intensity, heavy focus on strength.
- Two to four weeks of intensity: volume drops, intensity rises.
- One to two weeks of deload: not a full week off, but a genuine drop in volume and intensity to reset.
During the intensity weeks, resistance training doesn’t disappear, it shifts. Lighter loads, higher reps, which becomes part of the intensity work itself rather than sitting separate from it.
This is also why volume and intensity don’t get stacked together in this plan. A randomised trial in the Journal of Orthopaedic and Sports Physical Therapy, the “Run Clever” study, tracked recreational runners over 24 weeks, progressing one group’s running intensity and another group’s running volume. Both groups picked up injuries, but different ones: pushing intensity up led to Achilles and calf issues, pushing volume up led to kneecap and IT band problems. Other systematic reviews of running injuries back this up too, sudden increases in load, of either kind, are consistently linked to higher injury risk.
I’ve felt this one personally. A few years back I picked up runner’s knee and shin splints because I ramped up intensity and volume together, too quickly, once I got a bit carried away having a treadmill at home. Every time I’ve stacked heavy volume with high intensity, something has broken. That’s exactly why this plan keeps them apart, easy weeks stay high volume and low intensity, intensity weeks drop the volume right back down.
Long run training, the long, slow runs that build real endurance for the distance, only comes into play in meso cycles two and three, and even then it pauses during the intensity weeks of those blocks.
Aerobic phase (meso cycle one)
Monday: Lower body strength, then a run. 20 minute easy build into MAF heart rate, then 4 minute blocks at MAF with 1 minute easy recovery, out to 45 to 75 minutes total.
Tuesday: Low impact aerobic session (treadmill incline, stepper, or bike depending on how fresh I’m feeling), same 20 minute build then 4-on-1-off structure.
Wednesday: Question mark. Full rest, or if feeling good, a session similar to Monday’s run. Kept deliberately open so I’m fresh for Thursday.
Thursday: Strength session two, plyometric focus, plus a low impact aerobic session afterward (impact’s already covered by the plyo work).
Friday: Rest.
Saturday: Double session. Same run structure as Monday, plus an incline walk or stepper session, same build and interval pattern.
Sunday: Extra easy session or full rest, heading into Monday fresh.
Intensity phase
Monday: Run. 20 minute gradual build, then 10 minutes at MAF (or MAF plus 5), then 10 x 2 minute efforts at 80 to 90% perceived effort with 1 to 2 minutes rest between.
Tuesday: Full rest.
Wednesday: Same structure, low impact version (treadmill incline, stepper, or bike).
Thursday: Off.
Friday: Same running session as Monday.
Saturday: Rest.
Sunday (optional): Low impact version again, only if feeling good.
Deload phase
Monday: 20 to 30 minutes of mobility work, not just stretching, working through range of motion with activation, priming the body. Then 30 to 45 minutes of light aerobic work (walk or jog, whatever feels right on the day), at least 10 beats below MAF heart rate. Physical rest and mental rest both.
Tuesday: Static stretching plus some sauna work.
Wednesday: Repeat Monday.
Thursday: Repeat Tuesday.
Friday: Full rest.
Saturday: Long walk, brings some aerobic time back in, extra time on the legs heading into the next block.
Sunday: Rest, or optional static stretching.
Where this leaves you
This is what I’d do, based on my own experience and history. I wouldn’t hand this exact plan to everyone, but there’s a real lesson in it worth sitting with.
Think about how much volume your aerobic weeks actually need, and how much that volume has to drop once intensity comes into it. I see people mixing high volume and high intensity together constantly, and it usually ends badly. Most people don’t manage their nutrition well enough to handle both at once. Most professional athletes don’t even try to. So why would a busy parent with a job, a family, and everything else on their plate?
The hard part is knowing what easy actually feels like, especially once you’re in a running group, or watching everyone’s splits on Strava, and it becomes very easy to run harder than your body’s ready for.
Understanding your own limits, and the zones you should actually be training in, is exactly what I do with clients. If this has got you thinking about where you’re at, I’ll run you through an aerobic assessment and a movement assessment, and we’ll talk through what came up. From there I can tell you how much time you should genuinely be spending easy versus hard.
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