The motion in your hips is one of the most important components of the Cha Cha. Your hips should move to follow your feet. Move your hips to the left as you pop your left foot out. Roll them back and to the right to follow your foot back. If you’re dancing the Cha Cha alone, your arms will be loose without a partner to hold onto. Feel free to keep moving them to the rhythm of the music, following your hips as you move them match your feet. If you’re a woman, wear a skirt or dress that’s flowy with a lot of movement. You can also wear a scarf around your hips to accentuate their movement. Men can wear long pants with a high waist to accentuate the length of their legs. Men and women should both wear dancing shoes.

TL;DR in Indonesian:
Terus gerakkan panggul. Lemaskan kedua lengan Anda. Kenakan pakaian layaknya penari Cha-Cha.