Albert Barnes Commentary Psalms 18:32

"The God that girdeth me with strength, And maketh my way perfect?" — Psalms 18:32 (ASV)

It is God who girds me with strength—Who gives me strength. The word "girds" contains an allusion to the mode of dress among people in Eastern cultures: the long, flowing robe, which was girded up when they ran or labored so that it would not impede them. It likely also carried the additional idea that girding the loins contributed to strength. It is a common custom now for men who run a race, leap, or engage in boxing to gird or bind up their loins. See the note on Job 40:7 and the notes on Matthew 5:38-41.

And makes my way perfect—Gives me complete success in my undertakings; or, enables me to carry them out so that none of them fail.