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The Science

What is HiRIT? High-intensity resistance and impact training

The bone-targeted training method behind the LIFTMOR results — explained plainly.

4 min read · Medically reviewed by Dr. Emily Warren, DPT · Updated July 2026

Doctor of Physical Therapy (DPT) · BoneFit®-certified (Osteoporosis Canada) · LIFTMOR protocol–trained · Credentialed McKenzie (MDT) therapist · Mindful Movement Physical Therapies

Key takeaways

  • HiRIT = high-intensity resistance and impact training: heavy lifting (~80–85% of one-rep max, usually 5×5) plus brief impact loading like jumps.
  • In the LIFTMOR trial, twice-weekly supervised HiRIT increased spine bone density in postmenopausal women with low bone mass, with no fractures.
  • It's more effective for bone than gentle 'senior' workouts, but it must be learned with good technique and progressed gradually.

High-intensity resistance and impact training (HiRIT) is a bone-targeted exercise method that combines heavy resistance — about 80–85% of your one-rep maximum, typically 5 sets of 5 reps — with brief impact loading such as jumps or drop landings. In the LIFTMOR randomized trial, twice-weekly supervised HiRIT increased spine and hip bone density in postmenopausal women with low bone mass, with no fractures.

Why 'high intensity' matters for bone

Bone only rebuilds when the load it feels is meaningfully higher than what it's used to. Gentle, high-repetition exercise rarely crosses that threshold. HiRIT deliberately uses heavy, brief efforts — a few hard reps rather than many easy ones — plus impact, because bone responds most to loads that are large in magnitude and applied quickly.

The two ingredients

  • Resistance: compound barbell lifts (deadlift, squat, overhead press) loaded heavily, for low reps, with full recovery between sets.
  • Impact: brief, high-rate loading like jumping or drop landings, which sends a strong osteogenic signal to the hip and spine.
HiRIT is the engine behind evidence-based bone programs like LIFTMOR and Onero®. Bone Builder's Peak track applies the same principles — but only after you've built the strength and technique to load safely.

Is HiRIT right for everyone?

Not on day one. HiRIT is powerful precisely because it's heavy, so it demands good technique and a sensible on-ramp. People with a recent vertebral fracture, very low bone density, or no lifting experience should build up through lighter progressive resistance first, and get clearance from their provider. That staged path — Foundation to Build to Peak — is exactly how Bone Builder is structured.

Frequently asked questions

What does HiRIT stand for?

HiRIT stands for high-intensity resistance and impact training — a bone-loading exercise method that pairs heavy resistance training (around 80–85% of your one-rep max) with brief impact loading like jumping or drop landings.

Is HiRIT safe for osteoporosis?

In the LIFTMOR trial, supervised HiRIT was well tolerated in postmenopausal women with low bone mass and did not increase fractures. Safety depends on correct technique, graded loading, screening for fracture history, and avoiding loaded spinal flexion. It should be learned under guidance rather than jumped into unsupervised.

How is HiRIT different from regular strength training?

Regular strength programs often use moderate loads for higher reps. HiRIT uses heavier loads for fewer reps (about 5×5 at 80–85% of one-rep max) and adds a distinct impact component. That combination of high magnitude plus impact is what makes it especially osteogenic — good at signalling bone to grow.

Sources

Keep reading

Basics

Osteoporosis, explained simply

The Science

Why we lift heavy (safely)

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