Solution - Task 26: BMI and health band

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One possible program:

while True:
    height_meters = float(input("Height (m): "))
    weight_kg = float(input("Weight (kg): "))
    if height_meters > 0 and weight_kg > 0:
        break
    print("Height and weight must be positive.")

bmi = weight_kg / (height_meters * height_meters)
print("BMI:", round(bmi, 2))

if bmi < 18.5:
    print("underweight")
elif bmi < 25:
    print("normal")
elif bmi < 30:
    print("overweight")
else:
    print("obese")