Hi.
Oh dear, you really are going all out do you xD?
Ok first.
longieren or lunging is when you train a horse from the ground. A lunge is basically a long rope tyed to the horses harness or halter, depends on how you want to do it.
In one hand you hold the lunge and in the other stick to give out signals to the horse, even though if you have a well trrained horse, it will react to your body language or your voice.
And I tell you, lunging a horse can really develop arm muscles really really fast xD, I talk from experiences because I am doing this almost every week xd.
Regarding condition. Hmm wait, I think you are confusing something here.
You said that your condition increase from 22 to 30 after walking the horse for an hour. this is strange though because the condition should just increase by about 0.5 percent to 1.5 percent, I think you are confusing some numbers over here.
Regarding the condition, all skills, riding and lunging will increase your horses condition and use up training time, walking just increases condition and doesnt use up any training time.
Would you want me to take a look at your horses and maybe try finding out what the problem is?
Regarding the broken leg, yes, you have to wait half a year, but your horse will be ok after that again, even though you need to rebuild the condition from the ground up I suppose, I have never broken a horses leg so I am not really sure.
Greetings Moritz.