The left side of the heart performs the blank circulation

The left side of the heart receives unoxygenated blood back from the body, via the superior and inferior Vena Cava, and then forces the blood into the pulmonary circulation, via the pulmonary arteries. A good rule of thumb to remember the circulation involved is Left (as in side of the heart) Lung.

The right side receive blood from the lungs that is oxygenated and forces the blood out the Aorta in to the systemic circulation (the body)

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.