@MiloThePitbull: Honestly with the amount of work she does(4 hours is considered fairly lot, unless it would be mostly walking), I don't think she can get totally our of shape. Sure she looks tad chubby on the belly area, but most average horses often are.
@Leasing vs. Buying: Lot of good points already said I think. With leasing lot of things depend on the leasing contract and type of lease. Like is it full lease or not. With full lease you usually are in same situation as you'd be when owning a horse. You are resposible for all the cost and care related things. Pro is that you don't need to pay for the horse itself and often you might get to use it's own tack as well. Also if your life situation changes and you can no longer keep the horse, it's usually fairly easy to end the lease and give the horse back to it's owner. Physically at least, down side is if you get easily attached it might be emotionally hard when the lease comes to an end. Half lease etc. deals are pretty nice when you feel like gaining more independant riding/horse experience. You usually pay the owner small fee for using their horse(10-20e is pretty common here per one riding day), but other than that it's mostly enjoy type of deal for leaser. There may be bit more limitations on what you can do with the horse, but it really depends on the case.
I do think when leasing you should be extra careful and responsible with the horse, as it's not actually yours but rather someone else's. And that someone else wants that horse back in good condition. I've heard way too many bad lease stories where the horse was returned in bad shape and more than often lame. Accidents happen of course, especially with horses, but certain things can be prevented by being smart.
Owning is a love-hate thing really. You get the horse all to yourself and pretty much free hands to anything you want to(just try be smart though), but at the same time you are 100% resposible of it's everything. Cost vise you need to save up for the purchase price and then still have enough for emergency vet and all the running costs, like farrier and boarding. And if your life suddenly changes so that it gets hard to keep a horse, it may be hard to have it sold or leased out quick.
@the dreamer: When it comes to ski joring, I'd definetly choose a horse for it based on temperament rather than size.

If the horse has experience from pulling stuff that that's a huge plus.
@Summer or winter: Both have their pros and cons. Winter is very pretty time here if we have snow, but it can also be very cold. And if we don't have snow then it's just lousy and dark. Summer time I love for riding and also swimming, but Heta doesn't like that season due her summer itch... Can I say April-May? Warm enough usually so that I don't have to bundle up in clothes, but no bugs out yet, so I don't have to itch rug Heta.
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Snow, snow, snow, snow! Whippee!

As usual we had terrible dark black December and now that it's January the weather is cooling down and it started to snow yesterday so that we had lovely layer of snow by the eventing. Then it didn't snow during night or this morning, but now it's been snowing for good couple hours and the amount of snow has doubled.

Pretty happy as the arena was horribly hard yesterday when I tried to long rein Heta some. Mostly had to work her in walk and too just little bit of trot to get her going. I've also noticed she has less muscle behind her left shoulder than right, which could be from compensating another leg or someting else. Left front is also the leg that is sort of lame-ish, but not really lame. It's complicated, but I tested out somethings and if I put a weight boot on that leg she uses it as much as the right one. Though now I'm really starting to suspect she got bone spavin acting up on both of her hocks... : P Vets coming over tomorrow to vaccinate Tý and Feykja and treat/check several other horses, but unfortunately they didn't have X-ray machine available for that day anymore when I asked about it just before New Year. So that will have to wait until February I think, since that's the next time we have vet needs.