What is a 'Zing Day?' Samantha July 31, 2019 14:33 Updated Follow This is the number of days that you have completed at least one exercise session. Related articles What is 'Day's on program?' Can I Miss the Zing Boost if they make me stressed? Can more than one person use the same program? What is a 'Zing streak?' Comments 0 comments Article is closed for comments.