Zest

A state of overall physical fitness and health, feelings of excitement, positive energy, optimism and life satisfaction. Zest can also be cultivated in the workplace through the enhancement of one’s psychological well-being.

Reference:
Peterson, C., Park; N. Hall, N. & Seligman, M.E.P. (2009). Zest and Work, 30(2), 161–172. https://doi.org/10.1002/job.584