Coaching based on menstrual cycle

A computer program product for suggesting adjustments to an exercise regimen based on a menstrual cycle, the computer program product comprising non-transitory computer executable code embodied in a computer readable medium that, when executing on one or more computing devices, performs the steps of: acquiring heart rate data for a user from a wearable physiological monitoring device; identifying a menstrual cycle and a phase within the menstrual cycle for the user based on at least one of a resting heart rate and a respiratory rate of the user calculated using a heart rate variability of the heart rate data; determining a current recovery level for the user based on a prior sleep activity for the user; generating a recommended strain for new training activity by the user based on the current recovery level; and automatically adjusting a training recommendation for the user by increasing a strain of the training recommendation during an early follicular phase of the menstrual cycle and decreasing the strain of the training recommendation during a late luteal phase of the menstrual cycle.