Switching from Olympic to 70.3, Yousuli Help

The shift

An Olympic-distance triathlon takes most age groupers around 2 to 3 hours; a 70.3 takes 4 to 6 hours. The training, the fueling, the equipment, and the pacing all shift.

What stays the same

The threshold metrics (CSS, CP, run threshold pace) are still the anchor for zones.
The wizard structure is the same 7 steps.
The macrocycle phases (Base / Build / Peak / Taper / Recovery) are the same.
Wellness logging is unchanged.

What changes

Volume goes up

Typical weekly hours at peak:

Olympic build peak: 8 to 12 hours.
70.3 build peak: 10 to 16 hours.

Plan to add 2 to 4 hours per week through the 70.3 build. That mostly comes from longer long rides and long runs.

Long-session distance increases

Long ride: from 60 to 90 minutes (Olympic) to 3 to 5 hours (70.3).
Long run: from 60 to 75 minutes to 90 to 120 minutes.
Long swim: from 2000 to 3000 m to 3000 to 4000 m.

Intensity emphasis shifts

Olympic is closer to threshold-paced racing. Training emphasises Z4 to Z5 work alongside aerobic base.
70.3 sits at a lower percentage of threshold for most of the race. Training emphasises sweet spot (Z3b) and high Z2 to Z3a for sustained aerobic capacity.

Fueling matters dramatically more

For Olympic, an athlete can race on minimal in-race CHO (20 to 40 g per hour) and finish without bonking. For 70.3, you need 60 to 90 g of CHO per hour and a fluid / sodium plan.

Run the fueling planner specifically for the 70.3 distance and conditions. Do not extrapolate from an Olympic fueling plan.

Equipment matters more

CdA matters more at the longer distance. A 0.01 CdA reduction at 70.3 pace saves 1 to 3 minutes; at Olympic pace it saves seconds. Worth investing in a CdA test (see CdA Field Test).
Wheels and tires chosen for the course (rolling vs hilly).
Nutrition stowage: top tube bag, bento, bottle cages on the bike. Standardize the layout in training.

Mental preparation

Olympic is fast. 70.3 is long. Different mental skill: managing fatigue across hours, not minutes. Build long training sessions early to test the head, not just the legs.

The transition plan

If you have done Olympic and want to race 70.3 in 6 months

Months 1 to 2: keep Olympic-shape work; introduce longer aerobic sessions weekly. Test CSS, CP, run threshold fresh.
Month 3: dedicated build phase with progressively longer long sessions. Pick the periodization tag for the 70.3.
Months 4 to 5: peak weeks with race-specific sessions, race-pace bricks.
Month 6: taper, race-day brief, race.

If you have 12 weeks

Tighter. Consider the 12-week first-A-race plan as the framework but explicitly slot in longer sessions each week. Be realistic about the race result; first 70.3 on 12 weeks of build is a finish, not a peak.

Race day expectations

Pace conservatively on the bike. Variability matters (see Pacing the bike on a hilly course).
Fuel on schedule, not when you feel like it.
The first 30 minutes of the run is the test. Walk the first aid station; resist the urge to chase pace.

Switching from Olympic to 70.3