Roger Federer Is Giving Free Online Tennis Lessons in Quarantine

In addition to donating more than $1 million to families affected by the COVID-19 pandemic in Switzerland, the Grand Slam champion has been keeping himself occupied by offering his services as a tennis coach on Twitter. Federer, who has been posting videos of himself practicing trick-shots while self-isolating, shared a clip yesterday in which he demonstrated a solo drill that players can try themselves at home.

Heres a helpful solo drill. Lets see what you got! Reply back with a video and Ill provide some tips. Choose your hat wisely #tennisathome pic.twitter.com/05lliIqh1h Roger Federer (@rogerfederer)

Federer encouraged his followers to reply with clips of their own drills; and they did, in their droves. Tennis fans from all around the world posted videos of themselves attempting the challenge in their own homes, many of whom sported hats of their own in response to Federer's jaunty Panama.

He has spent the last 24 hours providing helpful feedback to a number of them on his timeline, including supportive commentary on their form and their hat game.

You do, love the flat cap. Feel like I need one too | https://t.co/Z0VzYhZWtv Roger Federer (@rogerfederer)

https://t.co/Woj4rDhJJR Roger Federer (@rogerfederer)

True but social distancing, hand wash and no shake hands etc at the moment is . Lets get this under control. Nice video https://t.co/HuRJn1qQJb Roger Federer (@rogerfederer)

Nice to reconnect Yashas, Looking good big guy, keep it up https://t.co/BrVicOQV9R Roger Federer (@rogerfederer)

noise epic Wow serious moves Bravo https://t.co/UnMk7lDLqg Roger Federer (@rogerfederer)

Rock solid https://t.co/CtXprO1t2n Roger Federer (@rogerfederer)

Against the mirror or window is extra difficult, forza Italia https://t.co/g2yv8TRFjx Roger Federer (@rogerfederer)

Dont lean back, strong in the wrist. Keep up the great work https://t.co/uAOlrY1n4i Roger Federer (@rogerfederer)

He's not sparing with his praise, either. The Olympic gold medalist called out some fans' technique as "epic" and "rock solid," provided constructive criticism and hints where needed, and most importantly, offered encouragement to keep up the good work.