From Yigal Mesika:
One of my secrets to properly using Loops® is to use them at the right moment. By this I mean you use objects that are naturally accessible and have focused attention on them. For example, if you meet somebody and they hand you their business card, you can take advantage of this moment by saying, “Let me show you something interesting with your card,” and then proceed to suspend it in mid-air. This is much stronger than asking to borrow a business card and then float it. In the first scenario, the effect seems unplanned and very natural. The second scenario seems as if you are prepared to perform the trick and your magic will be less believable. You want to make your magic seem spontaneous and unprepared. I have found that people appreciate this type of magic because it feels personal to them.
There is a myth out there that if you stretch Loops® a few times before your performance, you will increase their strength. I find that this is misleading information. Stretching the Loop will definitely weaken it. I hope you do fall victim to this.
If you want to learn the real work with Loops®, I recommend the Loops® DVD by Finn Jon and myself. Also, the Inner Circle card that comes with one set of Loops and the Animated Miracles pdf. This will give you everything you need to know.