Trainers will work with clients, either in a small group setting or one-on-one, on their fitness goals, including improving a client's muscular endurance, strengthening a client's cardiovascular capabilities, and increasing a client's physical flexibility. A trainer may also be asked to create or revise specific workout routines for their clients, to achieve extra weight loss, speed, or muscle toning. In some cases, trainers will also help clients with health & nutrition plans, such as recommending a food diary, or working with a nutritionist.