@type sides() :: :both | :left | :right

@type t() :: %WplAi.AST.RecoveryExercise{
  body_part: String.t() | nil,
  hold_seconds: integer(),
  intensity_rpe: integer() | nil,
  modality: String.t() | nil,
  name: String.t(),
  pnf: WplAi.AST.PnfSpec.t() | nil,
  reps: integer(),
  sides: sides() | nil
}