Dehydration, anxiety, poor physical conditioning, underlying medical problems and heart rhythm disturbances are all possible causes of a rapid resting heart rate. If you did not have an ECG at the time of the rapid rate it would be a good idea to try to obtain one the next time this happens. You can get an ECG at your doctors office or your local emergency room. If this fails to show the problem there are heart monitors that can be worn for an extended period of time to try to capture the rhythm. I would not be overly concerned about a heart rate of 96 unless this is a recurrent problem or you have any symptoms associated with this.
Information provided here is for general educational purposes only.
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