BMI (Body Mass Index)
Weight/height². Categories: underweight, normal, overweight, obese. Useful at population level; doesn’t distinguish muscle from fat. Use BMI calculator.
BMR (Basal Metabolic Rate)
Calories burned at complete rest. Base for TDEE. Mifflin-St Jeor is widely used.
TDEE (Total Daily Energy Expenditure)
Total daily calorie burn including activity. Key number for setting calorie targets.
Body Fat Percentage
Proportion of weight from fat. Navy method uses circumference; DEXA/BIA are more accurate but require equipment.
1RM (One Rep Max)
Heaviest weight lifted for one rep. Used to set training loads and track strength.
Heart Rate Zones
Ranges of max HR % for different training goals: recovery, fat burn, endurance, intensity.