What does that mean ? Consider this - in the Apostle Paul's letter to Titus, we learn that his word 'egkrate' is translated as 'self-controlled' in the New American Standard version, as 'temperate' in the King James version, and as 'disciplined' in the New International version.
#1, maintain our physical health: eat healthy, stay in shape, and see the doctor periodically (do all three).
#2, maintain our psychological health: by managing our stress, by pursuing relaxation.
#3, maintain our spiritual health: by working to pursue right actions [avoiding wrong], embracing compassion [helping and forgiving when we can], and working to grow our faith [as our gift to God].
And remember: We all need to think on the above and determine how best to be disciplined. In doing so, don't get tripped up by the . . .
"deeds of the flesh” (acts of immorality, impurity, sensuality, idolatry, sorcery, enmities, strife, jealously, outbursts of anger, disputes, dissensions, fractions, envies, etc.) Galatians 5:19-21