You aren't a first-time marathoner. You've already run ~10 marathons, so you have valuable endurance experience and probably some old adaptations that will come back relatively quickly. But because you're 52, haven't run seriously for almost a decade, and have only recently backed off your lifting, I would make the first 6–8 weeks deliberately conservative.
A 4:00 marathon is 5:41/km (9:09/mile). Based on a current 5K just over 30 minutes, that's an ambitious target today—but you have 32 weeks, prior marathon experience, and enough time to build toward it. I would treat 4:00 as the A goal, rather than promising that the current fitness level makes it inevitable.
I'd also put somewhat more emphasis on recovery than I did in my first plan. ACSM notes that recovery can take longer with age, while resistance training remains important; its 2026 resistance-training update also supports keeping major muscle groups trained at least twice weekly and tailoring volume to the goal.
Your revised weekly template
I'd use:
Day Workout
Mon 🏋️ Upper-body + light legs
Tue 🏃 Quality run
Wed 🏋️ Lower-body strength
Thu 🏃 Easy run
Fri 🏋️ Upper/bodybuilding + light legs
Sat Rest
Sun 🏃 Long run
The Saturday rest day is non-negotiable in my version of the plan. During heavy training, having 1–2 genuine rest days can be useful for recovery.
First, your running paces
I don't want to prescribe marathon-training paces based solely on your eventual 4:00 goal. Your current 5K says your fitness needs to come up first.
For the first couple of months, use effort more than the watch.
Easy / recovery
6:45–7:30/km initially.
You should be able to talk in complete sentences.
Don't worry if this feels ridiculously slow.
Long run
Approximately 6:50–7:30/km initially.
Again: easy.
Tempo / threshold
Initially around 6:00–6:15/km, progressing as fitness improves.
"Comfortably hard" is more important than the exact number.
Goal marathon pace
5:41/km
But I don't want you doing much running at 5:41/km until you've built the aerobic foundation to support it.
The 32-week version I'd actually give you
I've modified the original plan to account for your age, previous marathon experience and current fitness.
Weeks 1–8 — Re-entry
Week Tue Thu Sun Total
1 5 km easy + strides 5 km easy 8 km 18
2 6 km easy 5 km easy 10 km 21
3 6 km incl. 4×3 min tempo 6 km 11 km 23
4 5 km easy 5 km 8 km 18
5 7 km incl. 3×5 min tempo 6 km 12 km 25
6 7 km incl. 20 min tempo 7 km 14 km 28
7 7 km incl. 5×4 min tempo 7 km 15 km 29
8 6 km easy 6 km 11 km 23
Your only objective here: get your body accustomed to running again.
Don't chase your old marathon fitness.
At 52, your cardiovascular system may feel ready to do more before your tendons, calves and connective tissue are ready. That's one reason I'm deliberately ramping this more slowly.
Weeks 9–16 — Rebuild the engine
Week Tue Thu Sun Total
9 7 km tempo 7 km 14 km 28
10 8 km 7 km 16 km 31
11 8 km incl. 5×5 min 8 km 18 km 34
12 6 km easy 6 km 13 km 25
13 8 km incl. 3×8 min 8 km 18 km 34
14 9 km 8 km 20 km 37
15 9 km incl. 6×5 min 9 km 22 km 40
16 7 km easy 7 km 16 km 30
At the end of Week 16, I'd want you feeling strong rather than exhausted.
Important checkpoint
Around Week 16, run a 5K time trial.
If you've progressed substantially toward ~27–28 minutes, that's encouraging.
If you're still around 30 minutes, we don't panic—we simply adjust the 4:00 goal.
Weeks 17–24 — Start becoming a marathoner again
Now the long runs become serious.
Week Tue Thu Sun Total
17 9 km 9 km 20 km 38
18 9 km 9 km 22 km 40
19 10 km 9 km 24 km 43
20 7 km easy 7 km 18 km 32
21 10 km 10 km 24 km 44
22 10 km 10 km 26 km 46
23 10 km 10 km 28 km 48
24 7 km easy 8 km 20 km 35
Now the Tuesday workout becomes more marathon-specific.
For example:
10 km Tuesday
2 km easy
3 km @ ~5:55–6:00
2 km easy
3 km @ ~5:45–5:50
Eventually we'll bring portions of these workouts toward 5:41/km.
Weeks 25–28 — The big four weeks
Week Tue Thu Sun
25 10 km 10 km 26 km
26 10 km 11 km 29 km
27 9 km 10 km 30–32 km
28 7 km 8 km 22 km
Week 27 is your peak.
I would not have you run 42 km in training.
Your 30–32 km long run is enough. Your previous marathon experience means you don't need to prove to yourself that you can physically cover 42 km before race day.
Weeks 29–32 — Taper
Week Tue Thu Sun
29 8 km 8 km 24 km
30 7 km 7 km 18 km
31 6 km 5 km 12 km
32 5 km easy 4 km easy MARATHON
And then:
42.2 km / 26.2 miles
Goal: 4:00
5:41/km
If you're genuinely ready for 4:00, the race should feel controlled for the first 25–30 km.
Don't run the first 10 km at 5:25 because you feel fantastic. Your 52-year-old self will eventually send you an invoice for that decision.
The lifting needs a more important change
Because you want to keep your muscle bulk, I'm actually quite enthusiastic about keeping three lifting days.
But I would not do three bodybuilding workouts plus three serious running workouts.
We're going to use lifting to maintain muscle and strength while minimizing the damage to your running recovery.
Monday — Upper emphasis
3 sets each
Bench press — 5–8
Pull-ups/lat pulldown — 6–10
Incline DB press — 8–12
Cable row — 8–12
Lateral raise — 12–20
Biceps — 10–15
Triceps — 10–15
Then:
Goblet squat — 2 × 8–10
Calves — 2 × 12–15
Wednesday — Lower strength
This is your main leg session.
Squat — 3 × 5–8
Romanian deadlift — 3 × 6–8
Bulgarian split squat — 2 × 8–10
Hamstring curl — 2 × 10–15
Calf raise — 3 × 10–15
Core — 3 sets
But here's the rule:
Never take your lower-body sets to failure.
Keep roughly 2 reps in reserve most of the time.
The goal is strength stimulus, not destroying your legs.
ACSM's current guidance supports resistance training for both strength and hypertrophy, while emphasizing that training volume should be individualized rather than blindly maximized.
Friday — Upper hypertrophy + leg maintenance
Overhead press — 3 × 6–10
Chest-supported row — 3 × 8–12
Dips — 2–3 × 8–12
Lat pulldown — 2–3 × 8–12
Lateral raises — 3 × 12–20
Biceps — 2 × 10–15
Triceps — 2 × 10–15
Leg press — 2 × 10
Hamstring curl — 2 × 12
This gives you plenty of upper-body stimulus while keeping the Friday leg work modest.
Then we change the weights as mileage increases
This is the part I think will make the program work for you.
Weeks 1–12
Build muscle/strength
Normal progression.
If you hit the top of the rep range on all sets, increase the weight.
Weeks 13–20
Maintain/grow cautiously
Keep the weights fairly heavy but start trimming unnecessary leg volume.
Weeks 21–28
Marathon comes first
Keep the weight.
Cut sets.
For example:
Squat 3 × 6 → 2 × 5–6
RDL 3 × 8 → 2 × 6–8
You aren't losing muscle because you went from 9 sets to 6 sets. You're managing fatigue.
Weeks 29–31
Maintenance
About half your normal lifting volume.
Week 32
No meaningful leg training.
You want your legs to be hungry to run 42.2 km.
Your nutrition becomes extremely important
At 170 lb / ~77 kg, I'd make protein a priority.
For your particular combination of age + lifting + marathon training, I'd aim around:
130–160 g protein/day
Spread across the day rather than eating most of it at dinner.
ACSM notes that protein needs can increase with heavier training and that distributing protein across meals is useful for recovery in adults over 50.
And don't make the classic mistake of trying to become dramatically lighter while training for the marathon.
You have two competing objectives:
A. Run 4 hours
B. Maintain muscle
Trying to aggressively diet at the same time makes both harder.
One thing I'd strongly recommend
Because you're 52 and returning to marathon training after a decade, I'd consider getting a pre-training medical checkup, particularly if you have any cardiovascular risk factors or haven't had a recent checkup. That's not because 52 is "old"—it's because marathon training is a substantial increase in cardiovascular workload.
And if you develop persistent joint/tendon pain rather than ordinary training soreness, don't try to "run through it." Your aerobic fitness will improve faster than some of your connective tissues adapt.
Most importantly: let's use your 4-hour goal intelligently
I wouldn't decide today whether you're a 4:00 marathoner.
I'd use three checkpoints:
Week 8
How does a relaxed 10–12 km run feel?
Week 16
5K test.
Week 24
A 10K race/time trial.
Those will tell us a lot.
If by Week 24 you're around 52–54 minutes for 10K and handling 24–28 km long runs comfortably, 4:00 becomes a much more realistic target.
If you're considerably slower, I'd adjust the race strategy rather than force your body to run 5:41/km for 42 km.
The goal is not to train for eight months to run 4:00 at any cost. The goal is to train for eight months so that, if your fitness says 4:00 is there, you can take it.
And given that you've already completed 10 marathons, I think you have a particularly good shot at making a very satisfying comeback—provided we resist the temptation to train like the 42-year-old version of you who last ran one.
