Obesity and weight management

Obesity is medical, not moral

A client with obesity has a complex set of physiological, behavioral, and environmental factors at play. Approach the work without judgment, with patience, and with realistic expectations.

What "obesity" means clinically

BMI categories (imperfect but standard):

Normal: 18.5-24.9
Overweight: 25-29.9
Class I obesity: 30-34.9
Class II obesity: 35-39.9
Class III obesity: ≥40

BMI alone is limited — athletes are often "overweight" by BMI. Waist circumference adds context. Waist >40" (men) or >35" (women) indicates abdominal obesity with metabolic risk.

Special considerations for clients with obesity

Joint stress: every extra pound multiplies through the joints, especially during impact. Start non-impact. Cardiac: higher baseline risk. Get physician clearance for class II+ before strenuous training. Thermoregulation: more body mass = more heat retention. Be careful in hot environments. Self-image: many clients with obesity have been shamed in fitness settings. Make your space safe and non-judgmental. Movement quality: body mass affects range and balance. Modify accordingly.

Programming principles

Start where they are. Walking, water-based exercise, recumbent bike, seated resistance work. Build the habit before pushing intensity. Resistance training is non-negotiable. Lean mass preservation in a deficit is critical. Lift 2-3×/week from day one. Low-impact cardio dominates early. Walking, cycling, swimming, elliptical. Save high-impact for later if at all. Frequency over intensity. Daily movement beats 3 brutal sessions/week. Track progress beyond the scale. Photos, measurements, strength gains, energy, sleep, lab markers.

Nutrition coaching

For most clients with obesity, the leverage is nutrition more than exercise. Trainer scope:

General principles (protein, vegetables, hydration, sleep)
Habit-building (one habit at a time)
Macro framework if appropriate
NEVER prescribe specific diets for medical conditions

For class II/III obesity, refer to:

Physician for medical workup
Registered dietitian for medical nutrition therapy
Possibly bariatric specialist if interested in surgical options

Setting expectations

Realistic weight loss: 0.5-1% of bodyweight per week. For a 250lb client, that's 1-2.5lb/week. Faster rates rarely sustain.

Most clients can expect:

5-10% body weight loss in 6 months with consistency
10-20% over a year
Plateaus along the way — normal, not failure

Massive transformations exist but are not the average.

Common pitfalls

Pushing too hard too fast. Burns out clients, hurts joints. Public-facing exercises. Things that draw attention (kettlebells in busy gym areas) can be uncomfortable. Build private competence first. Scale obsession. Daily weigh-ins drive emotions. Weekly averages or skip the scale. Toxic-positivity coaching. "You can do anything!" feels hollow when fatigue, joint pain, and shame are real. Validate the difficulty. Ignoring sleep and stress. Cortisol from poor sleep undermines fat loss. Address recovery as much as training.

Post bariatric surgery clients

Different programming:

Lower calorie tolerance affects training capacity
Lean mass loss is common — resistance training is essential
Hydration and nutrition timing critical
Coordinate with bariatric team

TL;DR

Obesity is medical, not moral. Start with low-impact, build habits, prioritize resistance training. Realistic rate: 0.5-1% bodyweight loss/week. Refer to physician/RD for class II+ obesity. Track beyond the scale. Build a safe, non-judgmental training environment.