a new study finds water exercise provides an effective aerobic workout.
canadian researchers had healthy participants do exercise tests on both land and water cycles -- gradually increasing their intensity.
their maximum oxygen consumption -- which measures the quality of the workout -- was almost the same on both types of cycles.
in fact, the participants' blood pumped more efficiently while in the water.
researchers say water workouts are a great alternative for people who are overweight, have joint injuries or suffer from arthritis.