I love my tummy-time and playing on the floor. As you can see, I am training for sky-diving with my arms and legs up in the air. I can pivot on the floor and when I try to commando-crawl, I move backwards instead of forwards. I will learn.
I am happy rolling both directions now, however I still like to move into the tightest spot rather than play where there is space. I do my loveliest smiles in the morning, just when I have woken after a nice, long sleep :-).
I can sit for a few seconds and will take weight through my arms, but I wouldn't walk off just jet.....I sit for few seconds before my attention goes, I reach out and tumble over. Give me any toy and I will check if you can eat it.