Get served by this tennis-instructing drone

If tennis is your game and you're looking for help that a ball-spitting machine can't provide, luxury gym chain Virgin Active has your back. They've built a drone to drop your racquet's prey from above so you can work on your awful smash without any witnesses. Jokes aside, any effort to integrate UAVs with training expands the frontier of technology and sports. The tennis drone hangs the ball via extremely thin string and drops it on command. It also has a downward-facing 4K camera for coaches to monitor the player's form and technique.

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