Ornament of the Sutra Collection ཐེག་པ་ཆེན་པོ་མདོ་སྡེའི་རྒྱན།

The thirty-seven factors concordant with awakening are divided into seven sets:

1. the four foundations of mindfulness
2. the four correct efforts
3. the four limbs of miraculous power
4. the five faculties
5. the five powers
6. the seven branches of awakening
7. the eightfold path of the noble ones.

When we practice mindfulness of body we will get free of suffering caused by the body! This is described in Milarepa's song The Six Kinds of Happiness. The most profound recollection of the body is in Vajrayana, where we visualize ourselves as the deity and therefore we transform the body into emptiness, when we experience feelings of suffering they are also not truly existent.