I'm not athletic at all! Lol but thank you so much for answering. You explained it so well and definitely eased my mind. ;)
QRS Complex is the pattern we most often see on T.V. for an EKG. There are a number of sections to the EKG. A small bump on the horizontal line is known as a P-Wave, this is followed by a sharp upward line, then downward, then back upwards (These are the QRS sections), and back to the hozizontal line, followed by another bump which is the T-Wave.
QRS complexes is a fancy way of saying your heart beat 95,340 times in 24 hours, which is normal. Ventricular ectopics, you only had 12 (Far less than 1% of your total number of beats), that's excellent, I had 6,000 on my last Holter and they weren't worried about even that many.
Supra is a prefix used to mean "above", so Supraventricular means beats whose origin occurred above the ventricles. (There's 4 chambers in your heart, two on top, called the atrium, and two on the bottom, called the ventricles). You had 38 ectopics (premature beats). Really, you had an exceptionally normal Holter in this aspect, I'm willing to bet that any healthy person would experience as many or more ectopics in any 24 hours.
120 Beats Per Minute for 1 minute 31 seconds is likely from exertion, you were walking, or doing something, the heart naturally increases in rate due to exertion. Rate less than or equal to 50 bpm for 7 minutes 32 seconds, you probably were sleeping. It's normal for the heart to go slow during sleep.
Not wanting you to take my word for it, here's a heart rhythm specialist discussing resting heart rates. For athletic and young people, it may be normal for some people to have rates in the 30's, much slower than what they recorded for you.
http://www.drjohnm.org/2011/08/whats-a-normal-heart-rate/
No pauses, excellent. Based on this information your heart appears quite healthy, you should be very happy.