Dr Rick Hanson (author of the excellent little book Just One Thing) suggests a useful analogy with physical strength training in his essay "Grow a Key Inner Strength". He begins with a mini-taxonomy of psychological resources:
... and then recommends analyzing one's situation, identifying an inner strength that might help improve matters, and working to develop more of that trait. In Hanson's step-by-step prescription:
... fascinating, perhaps important, surely valuable to attempt!
(cf. "Grow a Key Inner Strength" at [1] or [2], and from Just One Thing thoughts such as Honor Your Practice (2013-01-04), Slow Down (2013-01-15), Strong and Lasting (2013-02-02), Bringing Back a Wandering Attention (2013-02-13), Patience (2013-03-03), Willpower (2013-05-01), Not Knowing (2013-06-07), Cause vs. Result (2013-06-17), Aspire without Attachment (2015-12-28), ...) - ^z - 2016-07-05