Alex De Minaur has picked up a reputation for being insanely fast on the court, but we're learning he's got an impressive lung capacity as well. The 19-year-old—humbly claiming swimming isn't his strong suit—showed he can carry a weight underwater across the length of a pool.

It's been an intense offseason for the pros, one full of unique workouts, but this one may win for hardest and most outside the box. The world No. 31 has also been working on his foot speed in creative ways:

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He enjoyed a meteoric rise in 2018, leaping over 170 spots and finishing runner-up at the Next Gen ATP Finals in Milan. He also reached two other finals, in Sydney and Washington. The Australian will have plenty of home support behind him in the new year.