There are various qualities of body, energy and mind that contribute to our overall wellbeing. If any of these qualities is deficient, we do not feel healthy and happy.
We tend to have a natural affinity with some of these qualities more than others, and this can lead us to focus on some areas to the exclusion of others. If we can identify areas where we are weaker, we will usually find training those areas makes more of a difference to our wellbeing than doing more in an area where we have already done a lot of work.
While many of these qualities can be trained individually, there are also practices that can more efficiently affect several at once.
My personal approach draws on the Yangsheng (nourishing life) practices of traditional Chinese medicine, the internal arts (predominantly Qigong, Neigong and Taijiquan), and a little modern research.