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At 10 weeks out, the ideal training structure is a classic 3-week build / 1-week absorb / 3-week build / 2-week taper / race week progression. This ensures you hit the the key bike sessions but manages fatigue so your running and swimming don't suffer.

The assumptions:

  • Ironman bike target = ~68–75% FTP
  • Long bike on Friday and long run on Saturday
  • Sunday recovery day
  • 50-year-old athlete with decent training history
  • Goal = strongest possible Ironman bike without compromising marathon performance

Key Focus for the Final 10 Weeks; the sessions ranked by importance:

  • Long race-specific ride + brick
  • Sweet spot progression
  • Threshold work
  • Low cadence strength
  • VO₂ max work

Many Ironman athletes do too much VO₂ work late in the build. The biggest gains now come from improving your ability to sit comfortably at race power for 5–6 hours while fuelling correctly and still being able to run afterwards.

For a 50-year-old athlete, I'd be particularly cautious about carrying fatigue into the run sessions. If you're feeling worn down, drop the VO₂ session before dropping the sweet spot or long ride. Those latter sessions are far more specific to Ironman performance.

A typical week becomes:

Day Session
Monday Bike quality session (Threshold/VO₂) + optional recovery swim
Tuesday Run quality session
Wednesday Sweet Spot bike session + swim
Thursday Medium-long run + swim
Friday Long bike + brick run
Saturday Long run
Sunday Rest day

Week 10 (10 Weeks To Go)

Monday – Bike Threshold

  • 4 × 10 min @ 95-100% FTP
  • 5 min recovery

Tuesday – Run Intervals

  • 15 min easy
  • 6 × 800m at half marathon pace
  • 400m jog recovery
  • Cool down

Total: 60-75 min

Wednesday – Sweet Spot

  • 3 × 15 min @ 88-94%

Wednesday Swim

  • 3,00m
  • 10 × 100m steady aerobic

Thursday – Medium Long Run

  • 75 min Zone 2

Thursday Swim

  • 3,000m

Friday – Long Ride & Brick Run

  • 3 hrs
  • 3 × 20 min IM power
  • 20 min easy run

Saturday – Long Run

  • 1 hr 45 min easy

Sunday - Rest Day

Week 9

Monday Threshold

  • 3 × 15 min

Tuesday Run Tempo

  • 3 × 15 min at marathon pace

Wednesday Sweet Spot

  • 3 × 20 min

Thursday – Medium Long Run

  • 1h 40 min Zone 2

Thursday Swim

  • 3,500m

Friday Long Ride

  • 4 hrs
  • Final hour IM power

Brick

  • 30 min

Saturday Long Run

  • 2 hr 10 min easy

Sunday - Rest Day

Week 8 (Recovery Week)

Reduce all volume by ~30%.

Monday

  • 3 × 8 min threshold

Tuesday

  • 45 min easy run

Wednesday

  • 2 × 20 min sweet spot

Thursday – Medium Long Run

  • 60 easy

Thursday Swim

  • 2,500m

Friday

  • 3 hr Zone 2 ride

Brick

  • 15 min

Saturday

  • 90 min easy run

Sunday - Rest Day

Week 7

Monday VO₂

  • 6 × 3 min

Tuesday Tempo Run

  • 2 × 20 min marathon pace

Wednesday Sweet Spot

  • 2 × 30 min

Thursday – Medium Long Run

  • 1h 45 min Zone 2

Thursday Swim

  • 3,500m

Friday Long Ride

  • 4.5 hrs
  • Final 75 min IM power

Brick

  • 35 min

Saturday Long Run

  • 2 hr 15 min

Sunday - Rest Day

Week 6

Monday Threshold

  • 2 × 20 min

Tuesday Run

  • 5 × 1 mile at marathon pace

Wednesday Over-Unders

  • 4 repeats:
  • 2 min @ 105%
  • 8 min @ 90%

Thursday – Medium Long Run

  • 1h 45 min Zone 2

Thursday Swim

  • 3,800m

Friday Long Ride

  • 5 hrs

Brick

  • 40 min

Saturday Long Run

  • 2 hr 20 min
  • Include final 30 min at marathon pace

Sunday - Rest Day

Week 5 (Biggest Week)

Monday Strength Bike

  • 4 × 10 min
  • 60-70 rpm

Tuesday Run Tempo

  • 3 × 20 min marathon pace

Wednesday Sweet Spot

  • 60 min continuous

Thursday – Medium Long Run

  • 1h 50 min Zone 2

Thursday Swim

  • 4,000m

Friday Long Ride

  • 5.5–6 hrs
  • Full nutrition rehearsal

Brick

  • 45-60 min

Saturday Long Run

  • 2 hr 30 min
  • Final 40 min marathon pace

Sunday - Rest Day

Week 4 (Peak Specificity)

Monday Threshold

  • 2 × 15 min

Tuesday Run

  • 90 min with 45 min marathon pace

Wednesday

  • 90 min continuous sweet spot

Thursday – Medium Long Run

  • 75 min easy aerobic

Thursday Swim

  • 4,200m

Friday

  • 5 hr race simulation

Brick

  • 60 min

Saturday

  • 2 hr easy long run

Sunday - Rest Day

Week 3 (Taper Begins)

Reduce volume ~40%.

  • Monday: 3 × 8 min threshold
  • Tuesday: 60 min run, 20 min marathon pace
  • Wednesday: 2 × 20 min sweet spot
  • Thursday:3,000m swim + 50 min easy run
  • Friday: 3 hr ride

Brick

  • 20 min

Saturday

  • 90 min easy run

Sunday - Rest Day

Week 2 (Final Taper)

  • Monday: 2 × 10 min sweet spot
  • Tuesday: 45 min run, 10 min marathon pace
  • Wednesday: 60 min easy ride
  • Thursday:2,000m swim + 45 min easy run
  • Friday: 90 min ride, 15 min race power
  • Saturday: 45 min run

Swimming

  • 2–3 short sessions
  • Plenty of rest

Week 1 - Race Week

  • Monday: Bike 60 min easy
  • Tuesday: Run 40 min easy
  • Wednesday: Swim 1,000m with race efforts
  • Thursday: Bike 45 min with pickups
  • Friday: 20 min swim + 20 min jog
  • Saturday: 15 min swim, 15 min bike, 10 min run
  • Sunday: IRONMAN

Expected Peak Week Volume (Week 4)
Swim: 10-12 km
Bike: 10-12 hrs
Run: 4.5-5 hrs
Total: 16-19 hrs

For a 50-year-old athlete this is usually close to the sweet spot: enough volume to maximise Ironman performance, but not so much that recovery becomes the limiter. If you tell me your current swim pace (e.g. 1:50/100m), FTP, and recent long run distance, I can make this much more specific to your likely Ironman finish time and race targets.