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When you breath be mindful of the start to end of the in and out breath. For each breath in and out breath be mindful of whether your mind wandered away during this time. Also note the length of the breath in and out breath.
When scanning the body keep your concentration anchored on the breath and sensation on the base of the nose as well. If your mind wanders away bring it back to Anapana and then continue the scanning. For each in and out breath see if your mind has wondered away for that period. Also note the sensations that arise when your mind wanders to an alternative object and the sensation when it is with the chosen object.
In some parts stay for a while (but not too long) also focusing on the breath. Sometimes this helps sharpen the mind to see clearly the sensation arising and passing away in the particular section of your body.
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Read Alan Wallace's "The Attention Revolution: Unlocking the Power of the Focused Mind".
For short, practice shamata. Practice to focus your attention on the breath, and practice to keep your focus on it as long as you can. Even if you can't sustain it for more than a few seconds, keep practicing. If you can sustain your focus on the breath, you can sustain it in any other meditations.
If you want a more didactic explanation from someone trustworthy, read Wallace's book.
Upvote:3
Firstly to my understanding Sila is very important part of a meditation practice. It purify the morality and ready your for the meditation.
If you have troubles with the meditation, I think the fist step is to start with Sila. Try to keep five precepts or the ten precepts. Without Sila, you cannot success with your meditation practice as it is the first step of the threefold training.
Secondly I think it is not a good idea to force yourself to keep the mind from wandering, if you try this you will find that over and over again the mind will wander. Be kind to the mind and let it to settle down. When you found it is wondered, just notice it accept it and bring it back to the meditation object.
Hope this helps.