Muscle isn't vanity. It's medicine.
What weighted vest training actually does...
The Research Library
Snow et al. · 2000 · Journals of Gerontology
5-Year Weighted Vest Program Prevents Hip Bone Loss
A 5-year program of weighted vest plus jumping exercise maintained hip bone mineral density and prevented age-related bone loss in postmenopausal women vs controls.
Klentrou et al. · 2007 · J Aging & Physical Activity
12 Weeks of Vest Training Reduces Bone Resorption 14.5%
Progressive weighted vest training (up to 15% body weight) reduced bone breakdown markers by 14.5% and improved ankle strength by 40% in postmenopausal women. Body fat decreased; lean mass increased.
Jessup et al. · 2003 Biological Research for Nursing
32-Week Vest Training Improves Femoral Neck BMD & Balance
Older women who completed 32 weeks of weighted vest walking, strength training, and stair climbing showed significant improvements in femoral neck bone density and balance vs sedentary controls.
Shaw & Snow · 1998 Journals of Gerontology
Weighted Vest Exercise Improves Fall Risk Indices
9 months of lower-body exercise using a weighted vest improved dynamic balance, muscle strength, power, and bone mass in postmenopausal women aged 50-75, directly reducing key risk factors for hip fracture.
Demirhan et al. · 2026 MDPI Life
Vest + Light Exercise Outperforms Vibration Training for Bone & Muscle in Osteopenic Women
8-week RCT in 31 women aged 60–79 with osteopenia or osteoporosis. Weighted vest plus light exercise produced greater gains in leg bone mineral density, T-score, leg lean mass, and physical performance than whole-body vibration training.
Hamaguchi et al. · 2017 BMC Geriatrics
Explosive Speed, Low Reps—An Efficient Way to Build Bone
In postmenopausal women with muscle wasting, quick and explosive low-repetition bodyweight training with a light vest significantly increased pelvic BMD in just 6 weeks. High-velocity muscle contraction serves as a safe, rapid osteogenic stimulus.
Petersen et al. · 2017 J Sports Med Phys Fitness
High Reps, Light Weights—Not Just Heavy Loads—Can Build Bone In untrained adults.
A high-repetition light-weight barbell program significantly increased BMD across the entire skeleton, while core training did not. High-frequency cumulative fluid flow serves as an alternative osteogenic stimulus.
Puthoff et al. · 2006 Medicine & Science in Sports & Exercise
Weighted Vest Walking Significantly Increases VO2 and Exercise Intensity
A weighted vest at 10-20% body mass significantly increases oxygen consumption, relative exercise intensity, and skeletal loading during treadmill walking, amplifying the cardiovascular benefit of the same walk.
Jing et al. · 2025 PMC
Vest Load Raises Cardiometabolic Demand—Effects Scale With Load
Vest load raises metabolic rate and heart rate in a dose-dependent manner. Each increase in load, speed, or incline produces measurable increases in cardiovascular demand. Study done on young adults.
Looney et al. · 2023 PubMed / US Army Research
Weighted Vest Loads Significantly Elevate VO2 and Heart Rate in Soldiers
In US Army soldiers, vest-borne loads significantly increased relative oxygen uptake and heart rate vs unloaded walking.
Shaw & Snow · 1998 Journals of Gerontology
Weighted Vest Exercise Improves Key Fall Risk Indices
Lower-body exercise with a weighted vest improved dynamic balance, muscle power, and strength in postmenopausal women, directly targeting the most critical modifiable risk factors for hip fracture.
Jessup et al. · 2003 Biological Research for Nursing
Vest Training Improves Balance Alongside Bone Density
32 weeks of weighted vest exercise produced significant improvements in both femoral neck BMD and balance in older women, addressing two of the three primary contributors to hip fracture simultaneously.
Ohlsson et al. · 2020 EClinicalMedicine
Heavier Weighted Vests Reduce Fat Mass via "Gravitostat" Mechanism
69 adults with obesity randomized to heavy vest (11% body weight) or light vest (1% body weight), 8 hrs/day for 3 weeks. The heavy vest group showed significant reduction in body weight and fat mass; lean mass preserved.
Guida et al. · 2025 INVEST Secondary Analysis
Weighted Vest Use Preserves Weight Loss
Weighted vest use can help preserve weight loss and inhibit weight regain in adults by preserving resting energy expenditure.
DeLong et al. · 2025 International Journal of Obesity
24-Month Pilot: Vest Group Regained Half the Weight, Diet-Only Regained All
Pilot follow-up of INVEST participants 18 months post-intervention: vest group had regained ~50% of lost weight; diet-only group had regained 100%. Small N — directionally consistent with metabolic preservation hypothesis.
Why we built this around the research
When Esther's mom was diagnosed with osteoporosis, bone health stopped being abstract—and navigating her own early perimenopause pushed her deeper into the research. She created Mad Alice, a Substack for women taking control of their health in midlife, not just reacting to it. Cortney's entry point was postpartum recovery: rebuilding her body and figuring out what it actually needed. She's built her health stack deliberately ever since. Together, they built The Carry around the science, so every woman has access to what they spent years looking for.
