I have the highest praise for Mark and his Alexander Technique lessons, both the group and individual lessons. When I first started going to Mark's classes I'd been suffering from severe repetitive stress pain from computer use in my arms, hands back, shoulders and neck. After a few months of attending group or solo lessons once a week the difference has been LIFE-CHANGING. Before the lessons I think it's fair to say I was in constant pain... but with Mark's amazing guidance, the pain has been reduced by 70-80%, and I have far more pain-free days than painful days. Highly recommended!