The ProArc Hybrid Fitness Dispatch

ProArc Weekly Hybrid Fitness Dispatch Issue 002 | 05 October 2025 - 10 October 2025

Estimated read time: 12 minutes

By ProArc

Disclaimer: Adjust for training age/injury history; consult a professional for specific conditions.

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This Week's TL;DR

  • Prioritise off-season strength for long-term gains.
  • Train your gut for high intra-race carb intake.
  • Focus on calf and Achilles strength for HYROX.
  • Use wearables to track trends, not just daily scores.

Programming & Periodisation

This week, we delve into structuring your training for maximum impact. From off-season priorities to managing training load, the focus is on building a resilient foundation for long-term performance and avoiding burnout.

Off-Season Strength Focus

Triathlon Hybrid-General Strength & Conditioning

Prioritise strength training in the off-season to build power, resilience, and improve body composition when endurance volume is naturally lower.

Building a strength foundation during the off-season enhances power, economy, and injury resilience. This period of lower endurance demand allows for focused gains in lean muscle mass and functional strength that directly translate to better performance and longevity in sport.

Try this:

Dedicate two primary sessions per week to strength training. Plan these sessions first, then build your endurance work around them, reducing overall endurance volume by 30-40%.

Managing Training Load

HYROX/DEKA Running Hybrid-General

Avoid large, sudden increases in training volume, especially in single sessions, to minimise injury risk and ensure consistent progress.

Injury is a complex interplay of training load, stress, sleep, and nutrition. While mileage isn't the only factor, big jumps in single-session duration (e.g., a much longer long run) are a significant, controllable risk factor for injury.

Try this:

If increasing weekly volume, consider splitting longer sessions into two-a-days (e.g., two 7-mile runs instead of one 14-miler) to allow for recovery and better quality.

Nutrition & Fuelling

Fuelling is fundamental. This section explores the controversial but rising trend of ultra-high carbohydrate intake during races and examines the critical role of macro-tracking for body composition, especially for athletes over 35.

High Carb Fuelling

Triathlon Running Nutrition/Recovery

Elite endurance athletes are pushing carbohydrate intake to 160-180g per hour, suggesting gut trainability is key to unlocking higher performance.

While 90g/hour was once considered the limit, top athletes are demonstrating that the gut can be trained to absorb significantly more. This allows for higher sustained intensity during long-distance events, but requires careful, progressive training to avoid GI distress.

Try this:

Gradually increase your hourly carbohydrate intake during long training sessions. Experiment with different glucose-to-fructose ratios and formulations to find what your gut tolerates best.

Macro Tracking Over-35

Hybrid-General Nutrition/Recovery Strength & Conditioning

For women over 35, tracking macros is a non-negotiable tool for awareness and achieving body composition goals due to hormonal shifts.

After 35, hormonal changes like decreasing estrogen lead to anabolic resistance and lower carb tolerance. This means higher protein intake is needed to trigger muscle building and that untracked calories from seemingly 'healthy' foods can easily halt fat loss.

Try this:

Track your food intake for one week without changing anything. Just observe your default habits and macronutrient distribution to gain awareness before making adjustments.

Training & Technique

Effective training isn't just about volume; it's about precision and specificity. We look at why targeted calf and Achilles work is a game-changer for Hyrox athletes and break down essential skills for beginner triathletes hitting the road.

HYROX Calf & Achilles

HYROX/DEKA Running Strength & Conditioning

Targeted, heavy calf and Achilles training is crucial for improving running efficiency and durability in HYROX and distance running.

The calf and Achilles complex generates over 50% of propulsive force in running. Strengthening them with heavy, slow exercises improves tendon stiffness, making the Achilles do more work. This makes your running more economical, saving energy for the stations.

Try this:

Incorporate heavy calf raises (standing and seated) and heavy isometric holds into your strength routine 2-3 times per week, preferably after key running sessions.

Beginner Cycling Skills

Triathlon Cycling

Beginner triathletes must master essential bike handling skills like cornering, braking, and riding in a group for safety and confidence.

The bike leg is the longest part of most triathlons. Developing fundamental skills beyond just pedalling improves safety, efficiency, and comfort, which directly impacts your energy levels for the run. Don't wait until you're in a race to discover you're uncomfortable on descents.

Try this:

Find an empty car park to practice skills. Set up cones to practice sharp turns, emergency braking, and one-handed riding to simulate reaching for a water bottle.

Recovery & Health

Recovery is when you get stronger. We explore how to intelligently use data from wearables like Whoop and Oura to guide training decisions, and discuss the underrated impact of daily habits on long-term athletic success.

Using Wearable Data

Hybrid-General Triathlon Nutrition/Recovery

Use wearables to monitor long-term trends and identify behavioral impacts on sleep and HRV, rather than making drastic daily training decisions.

While devices like Whoop and Oura are accurate for heart rate and HRV, their sleep stage data isn't perfect. It's more valuable to see how factors like alcohol, stress, or late meals affect your overnight metrics and adjust your behaviours accordingly, rather than blindly following a daily 'readiness' score.

Try this:

Instead of fixating on a low daily recovery score, look at the underlying metrics. Did your HRV tank? Did your resting heart rate spike? Correlate that with your previous day's actions (e.g., alcohol, stress) to learn your personal triggers.

Quick Hits

HYROX Considers Olympics

HYROX is reportedly exploring Olympic aspirations, signalling a major ambition for the sport's future growth and mainstream recognition.

Strict Judging at HYROX Major

The HYROX Hamburg Major saw a significant increase in penalty enforcement, particularly on burpees and wall balls, impacting elite race outcomes.

Heat Training for Altitude Gains

Long-term heat exposure (e.g., 5 weeks) can stimulate red blood cell and hemoglobin increases, offering adaptations similar to altitude training.

Helmet Lifespan Guideline

Bike helmets generally have a recommended lifespan of 5-7 years due to material degradation from sun exposure and general wear and tear.

Mental Rehearsal for Ironman

Visualising the course, key landmarks, and your race plan is a critical mental tool to prepare for the challenges of an Ironman.

Content Credits

Fitness Racing Podcast

HYROX Hamburg Major – Review Episode

Bernice Lineker

Hybrid Fitness Media

Can HYROX stay cool?

Tatum Brandt

The Nick Bare Podcast

142: What You Asked Me on Instagram

Nick Bare

Rox Lyfe - The HYROX Podcast

From NFL to HYROX: Jonah Rosner’s Sports Science Performance Hacks

Jonah Rosner

Hybrid Fitness Report

Hyrox Hamburg, ATHX intro & the League of Hybrid Fitness Sports (Ep9)

Paul Reynolds, Jude Reynolds

That Triathlon Show

Beginner Series 6 - Cycling for Beginner Triathletes

Mikael Eriksson

The TriDot Triathlon Podcast

Safety, Speed, & Style: Choosing a Bike Helmet for Triathlon

Mike Buenting

Triathlon Nutrition Academy

Whoop vs Oura – What the Science Says for Triathletes with Shona Halson

Shona Halson

Purple Patch Podcast

378 - Still Skipping Strength Training? Here’s What You’re Leaving on the Table

Matt Dixon

The Giddy Up Edge: Conversations on Getting Faster

From Chattanooga to Kona: Evan's Race Recap & Championship Preview

Michellie Jones, Evan Gruda

Menopause Strength Training & Fitness | 40+ Fitness for Women

The #1 Habit You're Skipping That's Sabotaging Your Fat Loss After 35

Robin