Reading time: 13 minutes | Last updated: May 2026
You’ve completed the Castiron Lift Beginner Programme — or you’ve stalled on linear progression and need a smarter system. The Castiron Lift Strength Programme is the next step. Built on Daily Undulating Periodisation (DUP) — the most research-supported programming model for intermediate lifters — it trains strength, hypertrophy, and power simultaneously across three days per week. Free. No app required. 12 weeks.
Table of Contents
- The Philosophy — Why DUP?
- Who This Programme Is For
- Programme Structure
- The Three Training Days Explained
- The Full 12-Week Programme
- Progression Rules
- Accessory Work
- Footwear Recommendations
- What to Do After Week 12
- The Research Behind DUP
- FAQ
🎯 The Philosophy — Why DUP?
Linear progression works for beginners because the nervous system and muscles are adapting rapidly to any new stimulus. Once you’re intermediate, that rapid adaptation slows — and training the same rep range every session stops producing results.
Daily Undulating Periodisation solves this by varying the training stimulus within the same week:
- Strength day: Heavy weight, low reps — trains the nervous system and maximal force production
- Hypertrophy day: Moderate weight, moderate reps — builds muscle mass to support future strength gains
- Power day: Near-maximal weight, very low reps — trains rate of force development and competition specificity
Rhea et al. (2002) in the Journal of Strength and Conditioning Research found DUP produced 28.8% strength gains vs 14.4% for linear periodisation over 12 weeks in trained subjects. This programme applies that research directly.
📌 Who This Programme Is For
| ✅ This programme IS for you | ❌ This programme is NOT for you |
|---|---|
| Completed Castiron Lift Beginner Programme or equivalent | True beginners — run the Beginner Programme first |
| Stalling on linear progression (6+ months training) | Advanced lifters — run Sheiko or Conjugate |
| Can train 3 days per week | Can only train 1–2 days per week |
| Squat ≥ 135 lbs / Deadlift ≥ 185 lbs / Bench ≥ 95 lbs | Below these strength levels |
🗓️ Programme Structure
| Detail | Spec |
|---|---|
| Duration | 12 weeks (3 x 4-week blocks) |
| Frequency | 3 days/week (Mon/Wed/Fri or similar) |
| Lifts | Squat, Bench Press, Deadlift, Overhead Press |
| Periodisation | Daily Undulating Periodisation (DUP) |
| Session duration | 60–75 minutes |
| Monday | Strength Day — 4x4–6 @ 80–85% |
| Wednesday | Hypertrophy Day — 4x8–12 @ 65–75% |
| Friday | Power Day — 5x2–3 @ 85–95% |
The Castiron Lift Strength Programme — DUP structure across three training days per week
💪 The Three Training Days Explained
🔵 Monday — Strength Day
| Lift | Sets | Reps | Intensity | Rest |
|---|---|---|---|---|
| Squat | 4 | 4–6 | 80–85% 1RM | 3–5 min |
| Bench Press | 4 | 4–6 | 80–85% 1RM | 3–5 min |
| Deadlift | 3 | 4–6 | 80–85% 1RM | 3–5 min |
| Accessories | 2–3 | 8–12 | Moderate | 90 sec |
🟡 Wednesday — Hypertrophy Day
| Lift | Sets | Reps | Intensity | Rest |
|---|---|---|---|---|
| Squat | 4 | 8–12 | 65–75% 1RM | 2–3 min |
| Overhead Press | 4 | 8–12 | 65–75% 1RM | 2–3 min |
| Romanian Deadlift | 3 | 8–12 | 65–75% 1RM | 2–3 min |
| Accessories | 3–4 | 10–15 | Light–moderate | 60–90 sec |
🔴 Friday — Power Day
| Lift | Sets | Reps | Intensity | Rest |
|---|---|---|---|---|
| Squat | 5 | 2–3 | 85–95% 1RM | 4–5 min |
| Bench Press | 5 | 2–3 | 85–95% 1RM | 4–5 min |
| Deadlift | 4 | 2–3 | 85–95% 1RM | 4–5 min |
| Accessories | 2 | 6–8 | Moderate | 2 min |
📅 The Full 12-Week Programme
| THE CASTIRON LIFT STRENGTH PROGRAMME — 12 WEEKS | ||||||
|---|---|---|---|---|---|---|
| Week | Block | Mon (Strength) | Wed (Hypertrophy) | Fri (Power) | Deload? | Focus |
| 1 | Block 1 | 4x6 @ 80% | 4x12 @ 65% | 5x3 @ 85% | No | Establish baseline |
| 2 | Block 1 | 4x5 @ 82% | 4x10 @ 68% | 5x3 @ 87% | No | Build |
| 3 | Block 1 | 4x4 @ 85% | 4x8 @ 72% | 5x2 @ 90% | No | Push |
| 4 | Block 1 | 3x5 @ 70% | 3x8 @ 60% | 3x3 @ 75% | DELOAD | Recover |
| 5 | Block 2 | 4x6 @ 82% | 4x12 @ 67% | 5x3 @ 87% | No | Reload |
| 6 | Block 2 | 4x5 @ 84% | 4x10 @ 70% | 5x3 @ 89% | No | Build |
| 7 | Block 2 | 4x4 @ 87% | 4x8 @ 74% | 5x2 @ 92% | No | Push |
| 8 | Block 2 | 3x5 @ 70% | 3x8 @ 60% | 3x3 @ 75% | DELOAD | Recover |
| 9 | Block 3 | 4x6 @ 84% | 4x12 @ 69% | 5x3 @ 89% | No | Reload |
| 10 | Block 3 | 4x5 @ 86% | 4x10 @ 72% | 5x3 @ 91% | No | Build |
| 11 | Block 3 | 4x4 @ 89% | 4x8 @ 76% | 5x2 @ 94% | No | Peak |
| 12 | Block 3 | 2x3 @ 75% | 2x5 @ 65% | 1x1 @ 100%+ | TEST MAX | New PRs |
📈 Progression Rules
| Situation | Action |
|---|---|
| Complete all reps at prescribed % | Add 5 lbs to upper body, 10 lbs to lower body next week |
| Miss reps on Strength or Power day | Hold same weight, don’t progress |
| Miss reps two weeks in a row | Reduce % by 5% and rebuild |
| Hypertrophy day feels too easy | Add 1 rep per set before adding weight |
🔧 Accessory Work
| Day | Recommended Accessories | Sets x Reps |
|---|---|---|
| Monday (Strength) | Lat pulldown, face pulls, tricep pushdowns | 3x10–12 |
| Wednesday (Hypertrophy) | Dumbbell rows, rear delt flies, leg press, leg curl | 3–4x12–15 |
| Friday (Power) | Ab work, glute-ham raises or Nordic curls | 2–3x8–10 |
👟 Footwear Recommendations
| Day | Squat Footwear | Deadlift Footwear |
|---|---|---|
| Monday (Strength) | Weightlifting shoes — heavy squats demand stable heel | Flat shoes or deadlift slippers |
| Wednesday (Hypertrophy) | Same weightlifting shoes — consistency across all squat sessions | Flat shoes (RDL) |
| Friday (Power) | Same weightlifting shoes — near-maximal weights require maximum stability | Flat shoes or deadlift slippers |
See our Best Squat Shoes 2026 — USA guide for recommendations at every price point.
🔙 What to Do After Week 12
| Your situation | Next step |
|---|---|
| Want to run it again | Reset to Block 1 with new 1RMs from Week 12 test |
| Want more volume | nSuns — higher frequency DUP |
| Want long-term simplicity | 5/3/1 |
| Preparing for competition | Sheiko — competition-specific periodisation |
📚 The Research Behind DUP
- Rhea, M. et al. (2002), Journal of Strength and Conditioning Research: DUP produced 28.8% strength gains vs 14.4% for LP over 12 weeks in trained subjects.
- Prestes, J. et al. (2009), Journal of Strength and Conditioning Research: DUP produced greater improvements in muscular strength and endurance vs LP over 12 weeks.
- Colquhoun, R. et al. (2017), Journal of Strength and Conditioning Research: When volume was equated, DUP and LP produced similar gains — volume is the primary driver.
- Schoenfeld, B. et al. (2017), Journal of Strength and Conditioning Research: Higher volume produces greater hypertrophy — supporting Wednesday’s hypertrophy day as a long-term strength builder.
FAQ
What is my 1RM if I don’t know it?
Use a rep max calculator: take a weight you can lift for 5 reps and multiply by 1.15 to estimate your 1RM. Start conservatively — it’s better to start too light than too heavy.
Can I add a 4th training day?
Yes — add an upper body accessory day on Saturday. Keep it light and focused on weak points. Don’t add another main lift day.
What if I miss a session?
Skip it and continue with the next scheduled session. Don’t try to make up missed sessions — it disrupts the DUP stimulus pattern.
Do I need weightlifting shoes?
For all squat sessions: strongly recommended. Three squat sessions per week at increasing intensities — consistent footwear is critical for technique and safety.
💪 The Castiron Lift Programming Pathway:
Beginner Programme (8 weeks) → Strength Programme (12 weeks) → nSuns or 5/3/1
Related Articles
- Linear vs Undulating Periodisation — USA
- Deload Week Guide — USA
- 5/3/1 Program Guide — USA
- Best Squat Shoes 2026 — USA
Written by T-K — Strength Researcher & Brand Strategist, Castiron Lift.