A method of synchronizing a heart rate parameter of multiple users includes generating a pacing signal at a specific frequency, measuring a physiological parameter of each of the multiple users, presenting to each user an output based upon the measured physiological parameter of the respective user, and presenting to each user an output based upon the generated pacing signal. The measured physiological parameter could include heart rate variability. In one embodiment, the step of presenting to each user an output based upon the generated pacing signal, include presenting a first user with a first output, and presenting a second user with a second output, where the second output is out of phase with the first output.