back-to-back?

[Eway]

"back-to-back" in the sentence below is a bit ambiguous to me:

"Rest and sleep will give your body the best chance to repair and take the course you want it to. At the very least, lie on the sofa with your feet up as often as possible. Watch videos back-to-back; read books."

Dose back-to-back here mean watch one video after another or actually watch videos with someone back-to-back?

[twostep]

"back-to-back" in the sentence below is a bit ambiguous to me:

"Rest and sleep will give your body the best chance to repair and take the course you want it to. At the very least, lie on the sofa with your feet up as often as possible. Watch videos back-to-back; read books."

Dose back-to-back here mean watch one video after another or actually watch videos with someone back-to-back?

Wtching one after the other.