This is most likely abdominal or pelvic muscle strain from the physical activity. These muscles can get tense or go into spasm and cause bilateral pain. Not a serious medical concern in most cases. If the pain is sharp, severe or comes with other symptoms, it needs evaluation.
Next Steps
Rest from the activity for a few days and see if the pain settles on its own. If pain persists, worsens or you have fever, nausea or any other symptoms, see a doctor for a proper examination. Consult me on Practo for more details.