Carrying the baby facing out and tipped forward is my favorite alternative tummy time position. It's very easy to do and especially great for heavier babies and petite moms because you do not need a lot of muscle to do this. In fact you can do this sitting or standing.
What you do is hold the baby against your stomach or hip while she's facing away from you. Lean her forward at the hips so she has to work to keep her body and head up. You can place a toy in front of her and then tip her forward. When she reaches for it, let her come back up by herself instead of assisting her.
