In dancing freestyle, draw from a variety of dance styles. Mix and match the moves. You might have a hip-hop move followed by something jazzy or borrowed from modern dance. You could even throw in a cha-cha-cha step. To add to your dance repertoire, consider taking dance classes--perhaps learn to rumba. Then, borrow the moves you like best, or sway and swing to the music as it moves you.
Begin basic freestyle by learning to hear and count out the beat. Be flexible and use whichever count sounds right to your ear. Start out your dance by stepping and moving on the beat. A simple step is shifting your weight back and forth, or stepping side to side. Once you are comfortable with keeping with the rhythm, add variations to keep your movements from becoming boring or tedious. For faster songs, consider half-timing the music. Step or move on alternate beats, hitting the one and three, but not the two and four. For slower music, listen for the in-between beats, the "and" beats, then double-time the music by hitting the beats and the ones in-between.
However you dance, express yourself. If the song makes you happy, then throw up your arms in a joyous gesture. Remember to let your whole body dance. Your head can sway and swing too. Even your fingers can dance. Spread your fingers and shake your hands like you were playing a tambourine really fast. Look at dances, such as belly dancing or hula, in which the hands and arms are expressive. Watch dancing programs for gestures, postures and poses that speak to you. Be creative and make up some of your own.