Overview

Most people doing "HIIT" or "conditioning" are running an unplanned mishmash of sessions week to week. One hard metcon on Monday, random EMOM Wednesday, a long session Saturday because they saw it on Instagram. It works for a while, then plateaus — and people blame themselves for not working hard enough, when the real problem is that untargeted hard work has a ceiling.

This guide is a 12-week macrocycle for advanced conditioning athletes — CrossFitters, functional fitness athletes, anyone training in the metcon space. It borrows block periodisation from strength sports and applies it to conditioning. Four phases, each with a distinct physiological target, stacking to produce genuine peak form.

Golden Rule: You cannot train all energy systems maximally at once. Phase-by-phase focus is how you move past plateaus — specialised stimulus for 3-4 weeks, then transition to the next.

Prerequisites

2+ years of consistent training in functional fitness or metcon-style work
Know your benchmark metcon times (Fran, Helen, Cindy, Grace, Karen)
Know your approximate 1RM on main lifts
Access to barbell + kettlebell + rower/bike + pull-up bar
4-5 training days per week available

The Four Phases

Phase	Weeks	Energy system focus	Intensity
1. Capacity / Base	1-3	Aerobic	Low-moderate, high volume
2. Threshold	4-7	Lactate threshold	Moderate-high, sustained
3. Power	8-10	Anaerobic / alactic	Very high, shorter
4. Peak / Test	11-12	Integration	Mixed, benchmark re-tests

Phase 1: Aerobic Capacity (Weeks 1-3)

Goal: Build the aerobic engine that everything else rests on.

Session flavour: Long (20-40 min) moderate-intensity sessions. Zone 2 heart rate mostly. Movement quality is priority.

Week template:

Day	Session
Mon	"Long Chipper" — 30 min AMRAP of 400m run + 20 air squats + 15 press-ups + 10 KB swings
Tue	Strength — back squat + accessory (no metcon)
Wed	"Row & Walk" — 30 min @ Z2 on rower + 15 min weighted carries
Thu	Rest or mobility
Fri	Strength — press + deadlift accessory
Sat	"Hike Day" — 60-90 min outdoor walk, ruck or hike
Sun	Rest

Phase 2: Lactate Threshold (Weeks 4-7)

Goal: Raise the intensity you can sustain for 5-15 minutes.

Session flavour: Medium-duration threshold work (10-20 min), repeat-interval formats.

Week template:

Day	Session
Mon	Threshold metcon — 15 min AMRAP 21-15-9 (kettlebell swings / box jumps / sit-ups), push it
Tue	Strength — heavy lifts (4-6 rep range)
Wed	3 × 8-min intervals — 400m run + 12 thrusters (moderate), rest 4 min between
Thu	Rest
Fri	Strength — heavy lifts + short EMOM finisher (8 min)
Sat	"Tempo 40" — 40 min continuous at comfortable-hard pace (mix of row/bike/weighted movements)
Sun	Rest

At the end of Phase 2, take a deload week: volume cut 40%, intensity cut 30%, longer rest.

Phase 3: Anaerobic Power (Weeks 8-10)

Goal: Develop the top-end — sprint capacity, explosive power, high-intensity repeatability.

Session flavour: Short (3-10 min), max intensity, long recovery.

Week template:

Day	Session
Mon	Sprint intervals — 8 × 45 sec all-out, 2:15 rest. Row / bike / sled.
Tue	Heavy strength — max-effort triples/doubles
Wed	"Fran" or similar benchmark — all-out under 10 min
Thu	Rest
Fri	Complex power session — 6 rounds of (3 cleans + 3 jerks) on 3 min clock
Sat	"Death by..." — 1 rep minute 1, 2 reps minute 2... until failure. Choose thrusters or burpees.
Sun	Rest

Recovery is NON-negotiable. Phase 3 sessions are short but psychologically brutal.

Phase 4: Peak / Test (Weeks 11-12)

Goal: Integrate everything. Re-run benchmarks to measure progress.

Week 11:

Day	Session
Mon	Re-test: Fran (21-15-9 thrusters + pull-ups)
Tue	Light accessory work, mobility
Wed	Re-test: Cindy (20-min AMRAP 5 pull-ups + 10 press-ups + 15 air squats)
Thu	Rest
Fri	Re-test: Helen (3 rounds of 400m run + 21 KB swings + 12 pull-ups)
Sat	Rest
Sun	Rest

Week 12: Active recovery only. Easy walks, light swimming, mobility. No metcons.

Then start Phase 1 of the next block, slightly heavier loads or tighter benchmarks.

Reading Your Own Body

A key skill of advanced athletes: interpreting fatigue signals to modulate training.

Green light (train as planned):

Resting HR within 5 bpm of baseline
Sleep quality normal
Appetite normal
Mood / motivation normal

Yellow (reduce intensity 20-30%):

Resting HR 5-10 bpm above baseline
Sleep disturbed
Diminished appetite
Low motivation

Red (rest day or recovery-only):

Resting HR >10 bpm above baseline
Very poor sleep
No appetite
Something feels "off"

Don't try to out-tough red signals. The athletes with multi-decade careers are the ones who listen.

Tracking Progress

Per phase, track:

Phase 1: Average HR during your long sessions. Trending down at same power = working.
Phase 2: Time or rounds for threshold metcons. Improving at consistent RPE.
Phase 3: Peak power outputs (highest watts on rower 45-sec sprint, fastest 500m row).
Phase 4: Benchmark times. Fran, Cindy, Helen — whichever you've done before.

Log everything in a training journal. Memory will lie to you about whether you're improving.

Integrating Strength Work

This plan assumes you want strength alongside conditioning. The balance:

Phase 1: Strength is primary; conditioning is aerobic support.
Phase 2: Balanced — both strength and threshold work progress.
Phase 3: Conditioning is primary; strength is maintenance (no new PRs this phase).
Phase 4: Strength is maintenance; conditioning benchmarks are priority.

If you're purely a conditioning athlete, you can still do the strength sessions — they're the "glue" that keeps tissues resilient under metcon loads.

Nutrition Across Phases

Phase 1: Eat enough. Base-building is aerobic; appetite may drop, eat anyway. Phase 2: Slight surplus if performance is priority; maintenance if body comp matters. Phase 3: Carbs must be prioritised — anaerobic work is glycolytic. At least 4-5 g carbs per kg body weight per day on training days. Phase 4: Eat the same as week 11. Nothing new close to test days.

Hydration matters across all phases. 3L+ water daily baseline; more in summer or if sweating heavily.

Common Mistakes

Treating every session like Phase 3. Chronic anaerobic work destroys aerobic capacity over months. You need balance.
Skipping Phase 1. It's the least glamorous and most important. Fitness past a certain point requires aerobic base.
No deload week between phases. Accumulated fatigue is the enemy of progress. Deload or die.
Changing the plan mid-phase. Trust the block. Changes should happen between phases, not during.

What's Next

Multiple cycles of this plan produce compounding gains. Each block, you can:

Tighten the benchmarks you re-test
Add new benchmark metcons to the Week 11 battery
Progress loads used in strength sessions
Consolidate gains — one block you focus on weakness, next block on capability

After 2-3 cycles (6-9 months), most advanced athletes see double-digit improvements in benchmarks that had plateaued for years. This is the value of structure: not "harder training," but smarter distribution of the hard training you were doing anyway.

For a different flavour, Metcon Programming covers session design. Periodisation & Annual Training applies similar principles to running.

Periodising Your Conditioning: A 12-Week Macrocycle🔒

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