public String toString() {
		return "Name: " + this.getName() + "\nAge: " + this.getAge() + "\nMaximum heart rate: " + this.getMaxHeartRate();
		/*
		 * Return format:
		 * Name: (first name) (last name)
		 * Age: (age)
		 * Maximum heart rate: (maximum heart rate)
		 */
	}