When it comes to your body, HIIT can do amazing things. "If utilised correctly and appropriately it can help your body to develop and maintain many qualities associated with being ‘younger’," says Tannahill. "Stronger muscles, better cardiovascular capacity, improved balance and increased insulin sensitivity. Ultimately these qualities are those that keep the body injury- and pain-free. "Of course HIIT is just like any other form of exercise, there is a ‘potential’ for injury," says Tannahill.