Is dancing for exercise forbidden?

The basic ruling for a woman dancing is permissibility, as long as it is not accompanied by something unlawful, such as the exposure of 'awrah (intimate parts), mixing with men, musical instruments, inciting fitna (strife/temptation), or hindering obligatory duties. Doing it excessively and making it a habit diminishes one's integrity (muru'ah) and invalidates one's testimony. Therefore, it is preferable to avoid it or not do it excessively. If it is accompanied by any of these forbidden things, then it is among the reprehensible acts.