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You might not have a full hour available for an indoor-cycling class, but there's no reason you can't get a great workout with this often-overlooked machine. When there's a line out the door for ellipticals and treadmills at lunch, there always tends to be a few bikes wide open and ready to go. This workout comes with its own fun playlist to keep things feeling fresh, so those 20 minutes fly by. Up the ante and challenge yourself by sprinting every time each song's chorus plays.
|"Talk Dirty" — Jason Derulo, featuring 2 Chainz||Low||50 to 60||Three to four|
|"Battleflag" — Lo Fidelity Allstars||Medium||70 to 90||Six to eight|
|"Dark Horse" — Katy Perry||Medium to high||60 to 70||Five to seven|
|"Drop It Low" — Ester Dean, featuring Chris Brown||Medium||80 to 90||Six to eight|
|"Drunk in Love" — Beyoncé||Medium to low||50 to 60||Three to six|