If you really are short on time and need to get the most from your trip to the gym, remember the "5".
#1. One size does not fit all. If the lady running on the treadmill makes it looks easy, I can guarantee you she has been doing it for a while. Start out walking. Be nice to your joints and they will last longer.
#2. First impressions can be a little scary. If you are a "newbie", get help. If you are not going to ask for help, start easy with the workout and build. Rome wasn't built in a day and you won't be either.
#3. Get to the point. Be friendly, but keep the "hello" short. You are there for a reason. Get to work. Starbucks is for socializing.
#4. What you do is as important as what you don't do. Do you find yourself doing your favorites over and over again? I have my favorites, too, but adding something new will get you something new.
#5. Focus on the most important issue. Why are you exercising? The answer will help you to stay motivated.