Typical week:

Day Session
Monday Bike - (1h) short / hard bike intervals
Run - optional easy run off the bike
Tuesday Run - fast threshold run session at 4 min per km
Wednesday Swim - (1h) hard IM distance swim
Bike - 90 min solid TT ride / longer intervals
Thursday Run - (2h) lMish effort long run
Friday Bike - (3h) Ironman effort (power creep OK 2nd half)
Run - (1h) run at IM effort off the bike
Saturday Run - Easy recovery run
Sunday Rest Day
Quick links to training weeks:

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. This plan is aimed at a 50-year-old athlete with decent training history who has the goal of the 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)

Day Session
MondayBike Threshold: 4 × 10 min @ 95–100% FTP, 5 min recovery
TuesdayRun Intervals: 15 min easy, 6 × 800m @ HM pace, 400m jog, cool down (60–75 min)
WednesdaySwim: 3,000m
Sweet Spot: 3 × 15 min @ 88–94% + Swim: 3,000m (10 × 100m steady)
ThursdayMedium Long Run: 75 min Z2
FridayLong Ride: 3h with 3 × 20 min IM power + 20 min brick run
SaturdayLong Run: 1h45 easy
SundayRest Day

Week 9

MondayThreshold: 3 × 15 min
TuesdayRun Tempo: 3 × 15 min @ marathon pace
WednesdaySwim: 3,500m
Sweet Spot: 3 × 20 min
ThursdayMedium Long Run: 1h40 Z2
FridayLong Ride: 4h (final hour IM power) + 30 min brick
SaturdayLong Run: 2h10 easy
SundayRest Day

Week 8 (Recovery Week)

Reduce all volume by ~30%.

Monday3 × 8 min threshold
Tuesday45 min easy run
WednesdaySwim: 2,500m
2 × 20 min sweet spot
Thursday60 min easy run
Friday3h Z2 ride + 15 min brick
Saturday90 min easy run
SundayRest Day

Week 7

MondayVO₂: 6 × 3 min
TuesdayTempo Run: 2 × 20 min marathon pace
WednesdaySwim: 3,500m
Sweet Spot: 2 × 30 min
ThursdayMedium Long Run: 1h45 Z2
FridayLong Ride: 4.5h (final 75 min IM power) + 35 min brick
SaturdayLong Run: 2h15
SundayRest Day

Week 6

MondayThreshold: 2 × 20 min
TuesdayRun: 5 × 1 mile @ marathon pace
WednesdaySwim: 3,800m
Over-Unders: 4 repeats (2 min @105%, 8 min @90%)
ThursdayMedium Long Run: 1h45 Z2
FridayLong Ride: 5h + 40 min brick
SaturdayLong Run: 2h20 (final 30 min marathon pace)
SundayRest Day

Week 5 (Biggest Week)

MondayStrength Bike: 4 × 10 min @ 60–70 rpm
TuesdayRun Tempo: 3 × 20 min marathon pace
WednesdaySwim: 4,000m
Sweet Spot: 60 min continuous
ThursdayMedium Long Run: 1h50 Z2
FridayLong Ride: 5.5–6h (nutrition rehearsal) + 45–60 min brick
SaturdayLong Run: 2h30 (final 40 min marathon pace)
SundayRest Day

Week 4 (Peak Specificity)

MondayThreshold: 2 × 15 min
TuesdayRun: 90 min (45 min marathon pace)
WednesdaySwim: 4,200m
90 min continuous sweet spot
Thursday75 min easy
Friday5h race simulation + 60 min brick
Saturday2h easy run
SundayRest Day

Week 3 (Taper Begins)

Reduce volume ~40%.

Monday3 × 8 min threshold
Tuesday60 min run (20 min marathon pace)
WednesdaySwim 3,000m
2 × 20 min sweet spot
Thursday50 min easy run
Friday3h ride + 20 min brick
Saturday90 min easy run
SundayRest Day

Week 2 (Final Taper)

Monday2 × 10 min sweet spot
Tuesday45 min run (10 min MP)
WednesdaySwim 2,000m
60 min easy ride
Thursday45 min easy run
Friday90 min ride (15 min race power)
Saturday45 min run
SundayRest / easy prep

Week 1 - Race Week

MondayBike 60 min easy
TuesdayRun 40 min easy
WednesdaySwim 1,000m (race efforts)
ThursdayBike 45 min with pickups
Friday20 min swim + 20 min jog
Saturday15 min swim, 15 min bike, 10 min run
SundayIRONMAN