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Even as one who encompasses with his mind the mighty ocean includes thereby all the rivulets that run into the ocean; just so, O monks, whoever develops and cultivates mindfulness directed to the body includes thereby all the wholesome states that partake of supreme knowledge. 
One thing, O monks, if developed and cultivated, leads to a strong sense of urgency; to great benefit; to great security from bondage; to mindfulness and clear comprehension; to the attainment of vision and knowledge; to a pleasant dwelling in this very life; to the realisation of the fruit of knowledge and liberation. What is that one thing? It is mindfulness directed to the body….
If one thing, O monks, is developed and cultivated, the body is calmed, the mind is calmed, discursive thoughts are quietened, and all wholesome states that partake of supreme knowledge reach fullness of development. What is that one thing? It is mindfulness directed to the body….
If one thing, O monks, is developed and cultivated, ignorance is abandoned, supreme knowledge arises, delusion of self is given up, the underlying tendencies are eliminated, and the fetters are discarded.  What is that one thing? It is mindfulness directed to the body.
Read more here http://www.bps.lk/olib/wh/wh155-p.html#S8
What techniques do you personally find helpful in cultivating mindfulness directed at the body?