Barre is a popular boutique fitness class type and is rising in popularity in London, particularly with millennial ladies. "Dancing Yoga"? It is actually a workout combining ballet, dance, pilates, yoga to music beats, with variations including interval training (sweat!) and pre/post-natal. The ballet roots and body resonates with women looking for an exercise that creates long, lean muscles (without the bulk) - think pulses, 'burn', resistance bands and light weights. Barre is the effective workout that celebrities swear by including Madonna, Victoria Secret's Angels and Ryan Gosling.