system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: atheletes and their lungs and hearts

What is the effect of regular exercise (athelete) on the
1.resting tidal volume
2.  Ressting Breathing rate
3. Resting Ventilation rate (minute ventilation)
4. Resting Cardiac volume
5. Resting Heart rate
6. Resting Cardiac output
Please only reply if you know, dont post your predictions

Edit: please note im asking about the athelete that is resting and relaxed, not while exercising. I want to know how exercise will affect his body permanently not at the moment of exercise.
gpt
Athletes have had their heart pumping at greater speeds for longer periods of time than most people, and have thus worked harder to pump more blood than most. When you work out a muscle harder, the cells grow, which is called hypertrophy. Athletes hearts slightly hypertrophy and thus can pump more blood in one beat than before (higher stroke volume). However their resting heart rate will be lower since the heart no longer needs to beat as fast when it pumps more blood per beat. Overall cardiac output = (stroke volume x heart rate) so as heart rate increases the cardiac output increases during excercise, and although stroke volume decreases slightly it does not decrease enough to decrease cardiac output until you reach a very high heart rate as you no longer give the heart time to fill. As far as breathing goes, when you heavily excercise your metabolized Co2 goes up and oxygen goes down due to consumption for ATP, thus increases breathing is required to breathe off co2 and breathe in o2. To do this more efficiently you take deeper breaths rather than faster ones to give air time to get to the alveoli and for gas exchange to occur. Thus tidal volume is increased and resting ventilation is lower. 

Source: Med student with the most basic/minimum understanding of physiology.