The criteria for the PAST (Pushups, pullups, situps, and a run) is very similar to the other Special Warfare fields as far as cals go. You can look at that criteria here. My the Pass the PAST program has swimming included, which I would recommend to anyone anyway as an alternative cardio exercise in between run days in order to lessen the impact of running on your legs and prevent shin splints. The only thing the PAST program does not include is rucking which is huge in SERE. So if you can already pass the PAST and would like a bigger challenge you could go for the Get Selected program.