Spring In One's Step Meaning

(idiomatic) enthusiasm, energy or a positive outlook or cheerful attitude.

Example:   After her promotion, she carried out her new position with a spring in her step and a contagious smile.
2011 March 2, Chris Whyatt, “Arsenal 5 - 0 Leyton Orient”[1], BBC:
  The hosts initially looked like they lacked a spring in their step, but fears of further agony evaporated in the seventh minute with a goal of typical Arsenal quality.