Apex, a mobile tennis-ball-serving robot that tracks and assesses players' returns. Well, the Acemate bot goes a step further ...

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The actress is seen holding a plank while tossing a tennis ball in the air with one hand and catching it with the other.

Have a tennis ball in your garage? It may unlock clues into your lifespan. A quick test of strength with a tennis ball may be able to tell you if you’re going to live to 100 years old.