If the firmware on your Elemnt (either the original Elemnt, Bolt or Roam) is recent, you can put workout files directly onto it's filesystem. You can put .fit and .mrc files on it, possibly also .erg files (I have not tried those). Workout files go into the 'plans' folder on the Elemnt. Then on the Elemnt, sync the planned workouts to make the workout available.
Cheers,
Ilja