Heart Rate Recovery Calculator

def heart_rate_recovery(peak_hr: int, one_min_hr: int) -> dict:
    """Calculate Heart Rate Recovery (HRR) and fitness level."""
    hrr = peak_hr - one_min_hr

    if hrr > 40:
        level = "Excellent"
    elif hrr >= 21:
        level = "Average"
    elif hrr >= 13:
        level = "Below Average"
    else:
        level = "Poor - consult a doctor"

    return {"hrr": hrr, "level": level, "peak": peak_hr, "one_min": one_min_hr}

def max_hr_estimate(age: int) -> int:
    """Estimate maximum heart rate using Fox formula."""
    return 220 - age

# Example: 35-year-old, peak HR 175 bpm, 1-min HR 135 bpm
age = 35
peak = 175
one_min = 135

result = heart_rate_recovery(peak, one_min)
max_hr = max_hr_estimate(age)

print(f"Age: {age}, Estimated max HR: {max_hr} bpm")
print(f"Peak HR: {result['peak']} bpm")
print(f"1-min HR: {result['one_min']} bpm")
print(f"HRR: {result['hrr']} bpm → {result['level']}")