Also there was a recent study saying isometric exercise, such as wall sits, was better then aerobics at lowering blood pressure. If a tai chi form spends a lot

Also there was a recent study saying isometric exercise, such as wall sits, was better then aerobics at lowering blood pressure. If a tai chi form spends a lot of time holding low stances, that could play a part. Zone-2 aerobics definitely has plenty of other benefits.