The tennis star, who recently released her health-focused book “Strive,” has joined the app WeWard as a brand ambassador and investor. Through her role, Williams will be featured in a new advertisement, advocating for the app and supporting in-app experiences and events.

The market for walking apps is heating up. One contender, WeWard, has been backed by Grand Slam tennis champion Venus Williams.

The tennis star will invest in and promote the app, which offers users rewards for walking and visiting specific sites.

WeWard, a free walking app that rewards users for every step, announced that tennis pro and entrepreneur Venus Williams has joined the company as an investor and ambassador.

Why the 7-time Grand Slam champ and serial entrepreneur is backing a startup that bills itself as the Duolingo of walking