I might be wrong, but your physio might not recommend the activity centre either - its again to do with the way they are supported by the seat thing, that its not good for hips. Although I think I read somewhere that as long as their feet are completly flat its ok, its if they have to be on tippytoes to touch the ground that causes problems. Like I said, I might be wrong so feel free to correct me.

FWIW, I've never used a jolly jumper,activity centre or bumbo with my kids (the only time we had a bumbo in the house, DD used it to try and climb over the back of the sofa and promptly lost consciousness when she fell ) anyway, they had there moments of boredom, but I'd either just change their scenery, or their toys. A little bit of boredom isn't going to hurt - in fact I'm sure I saw an article recently that we were made to have times of boredom so our brains can recharge. DD and DS are excellent at making their own entertainment now too (please don't get me wrong, I didn't leave them screaming or crying, but if it was just a grizzle or moan, I'd leave them for a bit whilst I did stuff). In regards to the rocker, DD was only ever happy in there if she was with me and i was doing something, so I'd only really use it in the kitchen whilst I cooked, or took it outside while I hung hte washing up and so on.