All vehicles must have two red lights visible from a distance of what

All vehicles must have two red lights visible from a distance of not less than 1,000 feet to the rear, or one red light visible to the rear for a distance of 1,000 feet and two red reflectors visible from all distances from 600 feet to 1,000 feet.

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.