Barry’s Bootcamp, the international fitness phenomenon, is hosting a one-off HIIT class at London’s Sky Garden to raise money for Alzheimer’s Society to support further research into dementia. Back for the second time, the Barry’s x Sky Garden class, taking place on Monday 17th September at 7.30pm, will see Barry’s bring back its highest ever class with over 180 people experiencing the signature Barry’s HIIT workout in the atmospheric Sky Garden, complete with panoramic views of the London skyline, 155 metres…