I adopted two 5 month old cats in October and have recently tried giving them access to outside. One has been out most days in the last week or so sometimes just for 10 minutes or so and a couple of times for around an hour. His sister has no interest whatsoever. I have gone out with toys but she turns round and goes straight back in before I can even get them out. It's not a massive issue, though I was hoping to lost the litter tray (at least for daily use) at some point, but I am also worried about her being bored. I avoided rescuing indoor cats because I don't think I can provide the stimulation they would need. These are the 4th and 5th cats I've had as a adult and I had 3 growing up and none have needed or wanted much playing with. My last cat I had from about 7 months (had to be pts at the age of 10) and he went out from the start so this is new to me. Any advice would be great.