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. LIFTMOR compared supervised training with low-intensity home exercise in 101 selected women over eight months. Spine and femoral-neck density outcomes favored supervised training; one minor lower-back spasm was reported. This does not prove fracture prevention.
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.
Is HiRIT right for everyone?
HiRIT is not appropriate for everyone and is not a required destination. An individual assessment and qualified direct supervision are needed for high-intensity work. Bone Builder suggests Foundation or Build from your reported background; it does not automatically recommend Peak. Completing a track or learning a technique does not establish readiness for heavier loading or impact. Current recovery, restrictions, or concerning symptoms need an individual plan before a generic guided session.