“The great advantage of choosing one's breath as the object of mindfulness training is that breathing is an instinctive and effortless activity, something which we do as long as we are alive, so there is no need to strive hard to find the object of this practice.” - The Dalai Lama
Whatever object you choose, stay with it for as long as you can. Even with this effort, you will notice your mind wandering. This is not a problem and it’s bound to happen a lot. As soon as you notice that your mind has wandered, simply bring your attention back to the object of meditation. This is part of the practice—going back again and again to the object of attention and each time we “wake up” from being lost in thought is a moment of mindfulness. Your intention and persistence are key ingredients for cultivating mindfulness.