Israeli dancing during the Three Weeks

Q: Is it permissible to go Israel dancing during the Three Weeks?
A: Both the dancing and the music are forbidden. Some authorities allow listening to A cappella music during the Three Weeks since it is not music but people singing. Nonetheless, dancing is forbidden (see Mishnah Berurah 551:16). It is permissible, however, to perform aerobic exercise during the Three Weeks and the music is even permissible since the purpose is not to listen to music but to keep the tempo of the exercising.