If you thought Kelly Rowland's career was relegated to waiting by the phone, waiting for Beyonce's call to get Destiny's Child back together (or collecting royalties for that sappy Nelly duet), "Motivation" offers evidence of the contrary. On Monday, she debuted the video to the Jim Jonsin/Rico Love-produced single on BET's "106 & Park," and the damp, sweaty video matches the song's intense sexuality. If this isn't the year's hands-down sexiest song thus far, it has to be in the discussion. Rowland, whose sultry voice could get a priest hot ("I don't want to feeeeeeel my legs"), weaves in and out of the minimal beat (Jonsin did Wiz Khalifa's sparse "On My Level," and it's easy to imagine "Motivation" coming from a session around the same time), setting the table for Lil Wayne's stuttering, after-hours guest-verse. (Is this the first rap verse to have "rain forest" censored?) Stack the pieces together and it's an understated knockout that gets sexier with each spin.