Two 14 year old competitive dancers are excited about the upcoming state championships. their routine has a lot of moves packed into a 2 minute song the partners execute together. the routine has them covering all four corners of the dance floor in that short time period. the dancers can expand the distance covered in a short period of time by improving their:

Speed? Unless you want a really detailed answer.

Magnesium! this is found if caves usually

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.