Assess the cardiovascular and metabolic risk of your clients based on body fat distribution. The WHR is a key indicator for detecting central obesity and planning effective interventions.
The WHR is the ratio between waist circumference and hip circumference. It is an indicator of body fat distribution that predicts the risk of cardiovascular and metabolic diseases better than BMI alone.
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The waist-to-hip ratio (WHR) is calculated by dividing the waist circumference by the hip circumference. It reveals how fat is distributed around the body — a high ratio signals central obesity, where fat accumulates around the abdomen rather than the hips and thighs.
| Body shape | WHR (Men) | WHR (Women) | Risk |
|---|---|---|---|
| Pear shape | < 0.90 | < 0.80 | Low |
| Intermediate | 0.90 – 0.99 | 0.80 – 0.84 | Moderate |
| Apple shape | ≥ 1.00 | ≥ 0.85 | High |
BMI only considers total mass relative to height — it cannot distinguish between a client who carries fat around the belly and one who carries it in the hips and thighs. The WHR fills that gap. Research, including the landmark INTERHEART study, has shown that abdominal fat is a stronger predictor of heart attack risk than BMI alone.
For personal trainers, this means the WHR is an especially useful tool at intake and for periodic re-assessment: it tracks genuine changes in metabolic risk even when the scale barely moves, keeping clients motivated and giving you objective data to adjust the programme.