Typical Training Week — Current Build Phase
Chelsea's week under Neal Henderson is deliberately non-rigid — the schedule is not fixed to a seven-day cycle. Sessions are sequenced based on readiness and specific stimulus goals. Hard days are genuinely hard, easy days are genuinely easy. One high-intensity session per sport per week. Down weeks built in regularly, not just before races.
The Down Week — Chelsea's Most Underused Tool (Now Built In)
Under Dan Plews, Chelsea never took a formal down week unless it was taper or post-race. Under Neal Henderson, down weeks are now programmed regularly — not as a response to fatigue, but as a proactive recovery tool. "I take down weeks now that are quite chill." Neal's view: "Tolerating something to me does not mean high performance. What I look for is adaptation and improvement." A week of lower volume every 3–4 weeks allows the body to absorb the preceding hard weeks, preventing the chronic fatigue cycle that derailed Chelsea's 2023–24 period.
Dan Plews Era vs Neal Henderson — What Changed
Chelsea is emphatic that Dan Plews was the right coach at the right time — they won a world title together. But by 2024, the approach had run its course. Here's exactly what changed.
Dan Plews era
Neal Henderson era
Intensity Distribution — Neal Henderson Model
Henderson's approach is explicitly polarised. "The hard is really hard and I am asked to be very disciplined when I'm going easy." One high-intensity session per sport per week is the cap. The rest is long, steady aerobic work. This is a direct departure from the upper-aerobic zone that dominated Chelsea's Plews-era training.
Chelsea's Exact Key Sessions
Every session below sourced from Chelsea's own words in the podcast and from Neal Henderson's published coaching methodology. These reflect her early 2025 build leading into a Kona target in October.
~1 min at VO2max into 1–1.5 min at Zone 3 · Multiple sets
Chelsea's key bike intensity session under Neal Henderson. Short VO2max efforts (~1 min true max effort) immediately blending into a sustained Zone 3 effort — the "1 min into Zone 3" format. Henderson describes these as micro-intervals. The contrast with her Plews-era sessions is stark: she previously cried on the garage floor during 3–5 minute VO2 efforts in January. "Now I feel like I could do a couple more intervals — I'm not throwing up during these workouts." The session is calibrated to the season: not maximal, but hard enough to restore top-end capacity. Followed by regular lactate field testing to confirm zones.
Low cadence, high torque work · Single-leg drills · Pedal stroke correction
Neal Henderson's first major addition to Chelsea's bike training. "No one ever taught me how to pedal a bike." Low cadence big gear work and single-leg drills are teaching Chelsea pedal stroke mechanics she never had — something Henderson has used with Taylor Knibb and Flora Duffy to develop cycling efficiency. Short sessions working on cadence and high-cadence turnover as well. "I'm really interested to see how it impacts my efficiency as we get into the meat of the season." This is the foundational investment that pays dividends when the longer threshold efforts come in later blocks.
5–6 hour long ride · Not fixed schedule · Lactate field testing en route
Chelsea's peak Ironman long ride under Henderson is 5–6 hours — similar to her Plews era. But the key change is frequency: previously one fixed long ride per week, now "every 10 days or something — the schedule is not so fixed." Neal followed Chelsea on an e-bike two weeks out from Kona 2025, stopping every 1.5 km to take a lactate sample to assess her "breaking point" in real time. This kind of field testing shapes the next training block precisely rather than relying on fixed targets. Chelsea says: "Nobody gets a benefit from having done the most hours before a start line. It's who can perform on the day."
40–60 minute sustained intervals · "Insane" but doable when fit
Chelsea's favourite session when truly fit and in Ironman block — long sustained intervals of 40–60 minutes. "It's daunting, but you know you can do it, and you're going to feel really accomplished when you get it done." These are the sessions that define Ironman run fitness. Not short intervals — a sustained effort at threshold or sub-threshold that mirrors the demands of the marathon run. Currently she is only running ~25 miles per week with "really cruisy running" and some fartlek. These big intervals are the destination, not the current state.
Squad sessions · Short VO2 intervals · Community accountability
Chelsea swims with Julie Dibbins' squad in Boulder three times per week. The squad format is a major change from her previous solo swimming — "it's relieved a lot of the mental motivation that goes into training by yourself." The current focus is short VO2 max intervals in the pool with a good crew: "we all go off the same send-off and you can race each other, which has been really fun." Chelsea doesn't have to think about it — she shows up at 9 am, does the session, and leaves. The simplicity of this structure removes the decision fatigue of solo training and provides consistent community accountability.
Significantly reduced volume · All sessions genuinely easy · Full absorption
The most structurally important element of Chelsea's new program — and the thing most absent from her previous training. "Before I would never have taken a down week unless it was before or after a race." Now, down weeks are programmed proactively, not reactively. Neal Henderson's principle: "Tolerating something does not mean high performance. I look for adaptation and improvement." The down week is when training adaptations are locked in. Without it, the training stimulus accumulates without being absorbed — the exact trap Chelsea was in throughout 2023 and 2024.
4-Week Training Block — Ironman Build
Built from Chelsea's own description of her Neal Henderson program and his published coaching methodology. Week 3 is a hard peak week. Week 4 is a down week — not a taper, but a full absorption week. This pattern repeats throughout the season. The hard weeks are harder for the down weeks existing, and vice versa.
Neal Henderson's first step with Chelsea was performance testing — lactate, pace, and power baselines — before writing a single session. "Testing early is about identifying the intensity dial and getting it calibrated effectively, because you don't want to just train where you were." The testing-first approach is what allows the micro-intervals to be hard enough to stimulate adaptation without tipping Chelsea into the overreaching cycle that damaged her in 2023–24.
Chelsea's Kona 2022 win on a 6-week build is the counter-intuitive lesson at the heart of this program. "The mistake was, now that you're more healed from childbirth, we can push even more — when I probably nailed it the first time." Short, concentrated, well-rested builds outperform long exhausting ones for Chelsea. The 2022 Kona victory proves it. Neal's job is to recreate that stimulus deliberately rather than by accident.
Chelsea describes the feeling she is rebuilding: "In the past I've looked forward to those insane intervals that are 40–60 minutes long in a masochistic type way — you know you can do it and you'll feel really accomplished." The goal of this week is to engineer that feeling — hard enough to feel heroic, not so hard that it breaks confidence or accumulates debt. Neal's calibration: if Chelsea feels like she "could do a couple more" at the end of the VO2 session, the prescription is correct. If she is lying on the floor, it's too much.
Neal Henderson's most important coaching statement: "Tolerating something to me does not mean high performance. What I look for is adaptation and improvement." The down week is where improvement actually happens — in the rest and recovery after the hard weeks, not during them. Chelsea's 2023–24 chronic fatigue cycle was caused by never having these weeks. The training debt accumulated without ever being repaid. Every coach applying this model should treat the down week as sacred — not optional, not reactive, not shortened when the athlete feels good. It is the mechanism that makes everything else work.
Why It Works — Coaching Keynotes
Chelsea Sodaro's blueprint is a story of recovery, recalibration, and rediscovering joy. These keynotes come directly from her own words and from Neal Henderson's published coaching philosophy. They speak to the hardest lesson in endurance sport: doing less is sometimes the hardest and most courageous thing an athlete can do.
Data Sources
All training data in this blueprint is sourced from the athlete's own public statements, verified interviews, and published race data. Nothing is inferred or fabricated.
The Triathlon Hour (2025) — Chelsea Sodaro Interview
The primary source for this blueprint. Chelsea describes training philosophy, methodology, key sessions, and race preparation in their own words. All quoted material and specific numbers in this blueprint trace directly to this interview.
Supplementary Research — Published Race & Training Data
Race results, split data, and training context cross-referenced from published race data. Used to verify the plausibility of stated training numbers and to contextualise the athlete's competitive trajectory. No training data comes solely from this source without primary-source corroboration.