hey everyone!! i have a few questions about weight lifting. I have a weight lifting machine thingy... I dont know what its called. But it basically has everything on it. No one has ever explained how many reps to do, or how many in each rep... etc... so I'm kinda confused!! So heres the info... I'm 14, 5'6, female... not overweight.. just want to tone, and build a little muscle, especially on my arms... sooo can anyone explain it to me!?!?!