Perhaps it was due to the fact that I was relatively tired tonight, but I had a difficult time keeping my focus during my session. I found myself wandering and bringing myself back more than usual. Toward the end of the session I caught on to some more things that helped and I thought I would share for anyone else that has issues with this. These are some rules of thumb I've sort of developed in my practice:
1) Think of your session as a bunch of attempts to move an object instead of 1 attempt.
2) Changing positions can be pretty useful, especially if you're tired. This also includes changing the object's position. Blow on it, shove it, spin it, roll it, or whatever, this will help you get a fresh start.
3) Change up your method. If you have several techniques or methods that you use, change it up. I cycle through about 3 different methods that all seem to work for me. If you use visualizations, it wouldn't be a bad idea to change those up as well. I have a bunch of goofy visualizations that I use, and I will often oscillate between cycling through them and abandoning visualization altogether.
4) If you have moved the object you are working with already and are aiming for more control but are losing motivation because of slow and less noticable progress, just move on to the next object. Control will come with power.
5) Intentionally distract yourself. Yes, you heard me right. I like to have my phone on the desk close by and I'll lean over to check the time. Once in awhile movements will also unexpectedly occur during a distraction, so it may not be all so bad.
If you do get distracted, fight yourself every step of the way. This will help you build awareness of your mind wandering. If you continue to bring yourself back, your mind will gradually give up on trying to break your concentration. Another important point to note is that distractions in which you initiate are much better than ones that you don't. Distractions that come about without you initiating them tend to take control and often do so in a sneaky fashion.
So these are my ways to keep myself focused. How do all of you keep your focus up during your sessions?