curl --request GET \
  --url https://api.rewind.rest/v1/running/activities/{id}/splits \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "split": 1,
      "distance_mi": 1,
      "moving_time_s": 495,
      "elapsed_time_s": 500,
      "elevation_ft": 85,
      "pace": "8:15/mi",
      "heartrate": null
    },
    {
      "split": 2,
      "distance_mi": 1,
      "moving_time_s": 470,
      "elapsed_time_s": 475,
      "elevation_ft": 120,
      "pace": "7:50/mi",
      "heartrate": null
    },
    {
      "split": 3,
      "distance_mi": 1,
      "moving_time_s": 482,
      "elapsed_time_s": 488,
      "elevation_ft": 95,
      "pace": "8:02/mi",
      "heartrate": null
    }
  ]
}