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The transition from Indian Wells to Miami poses one of the toughest tests of the spring schedule.

The heat and dry desert air of Palm Springs gives way to the humid swelter and sometimes swirling winds of Key Biscayne.

Watch: Future No. 1 Players

That puts footwork and fitness at a premium.

Here's how some players prepare.

Genie Bouchard shows fast feet working up a hearty sweat.

 

A video posted by Genie Bouchard (@geniebouchard) on

Mar 19, 2016 at 2:53pm PDT

 

💦

A video posted by Genie Bouchard (@geniebouchard) on

Mar 18, 2016 at 5:39pm PDT

Sloane Stephens shows sometimes you control the ball.

 

I will not be outworked #ruleyourself @underarmour

A video posted by Sloane Stephens (@sloanestephens) on

Mar 9, 2016 at 10:56am PST

Sometimes the ball gets the best of you, like during this birthday ball shower.

 

Birthday Celebrations 💕

A video posted by Sloane Stephens (@sloanestephens) on

Mar 20, 2016 at 11:24am PDT

Dominika Cibulkova works on being well-balanced.

 

Hard work is the only answer 💪🏻💪🏻💪🏻 #POME #fighter

A video posted by Dominika Cibulkova (@domicibulkova) on

Mar 16, 2016 at 11:21am PDT

On court and off-court, too.

 

#workit with @katarinajurcikova ☝🏻️💪🏻😊

A photo posted by Dominika Cibulkova (@domicibulkova) on

Mar 18, 2016 at 9:25pm PDT

Andrea Petkovic performs planks on the beach.

 

haaai there. #assdown #plankschmank

A photo posted by @andreapetkovici on

Mar 18, 2016 at 6:44pm PDT

Ana Ivanovic opts for yoga to aid flexibility and mobility.

 

Yoga game on point to maintain flexibility and mobility. Reach and hold!! #YogaLover #Strength #Fitness #HereToCreate @adidaswomen

A photo posted by Ana Ivanovic (@anaivanovic) on

Mar 19, 2016 at 1:28pm PDT

Simona Halep takes early-morning medicine.

 

#letshaveagoodday#goodmorningmiami#👊🏼💪🏽😄🎾❤#️annnnd#dontforgettosmile😁#sweatmorewhineless💪🏽😄#lovemytshirt#adidas

A photo posted by Simona Halep (@simonahalep) on

Mar 22, 2016 at 5:05am PDT

Victoria Azarenka finds her groove with a special friend.

 

That's my best friend @iamgaelmonfils

A video posted by Victoria Azarenka (@vichka35) on

Mar 22, 2016 at 6:41pm PDT