What are some alternatives?
When comparing Karrot Fit and Optimity: Live.Work.Play, you can also consider the following products
iRewardHealth - Motivating healthy behavior change
Physio Health - Stay healthy, get rewards.
SQRL - Save $1 for every 1000 steps you take
Squat for crypto - Earn Crypto for exercising
Fitocracy - Fitocracy is a social network that turns exercise into a cooperative and competitive exercise with friends, rivals, and strangers.
Zero - Everything you need to quit smoking, delivered in a kit