Sounds like good solid advice - few more tips, most cats cant resist lazer pens (although none of my oldies have liked them!!). Every cat I have had has had their own favourite toy, something they will always play with, it is just a case of finding it, and some of them haven't been true cat toys. Another one I like is making them 'work' for their food - some people say to hide their dry food to make them hunt, but none of mine have gone for that idea, so what I do instead is only give them wet for brekkie and tea, nothing left down all the time, and then at supper time, I either throw their dry food (counted or weighed out) a piece at a time, or, depending on the other cats in the house, scatter their full amount over one room, and make them have to wander round the room - I have just done that with Lucy, and I gave her three 'treats' (really Hills hairball food!!) thrown individually to make her wander more. With Tom, I used to leave his dry food upstairs, go up to get it, so he would run up behind me, then throw his allowance over the banister (open plan front room), so he would run back down stairs to go and find them!! Does she go outside? Admittedly 1kg doesn't sound too bad, but it does depend on each cat - Ginger was only 1kg overweight, my neighbour couldn't see anything wrong with him, yet I could.
