Improving muscle/condition?

[nemo_]

My boy is currently quite lean but I've got a lot of showing coming up with him so would like him have a bit more condition. Please don't read that as I want him to be fat, but he definitely needs more muscle, especially on his quarters. So what exercises can I do to build him up? The obvious thing for me would be hillwork but I have very limited hacking with no hills .
He's currently fed 1 mug Spillers Lite Balancer, High Fibre Cubes, Hifi and a handful of Speedibeet, on decent grazing 10 hours a day and a large haynet overnight. Obviously nutrition plays a big part in any muscle gain etc, so is there anything that could/should be changed to help?
Sorry if this is a bit rambly, any suggestions most appreciated

 

[nemo_]

*Bump*

 

[LaurenM]

Not much use with the exercises but my mares on Allen & page - calm and conditioner. I would definitely recommend it!

 

[zoon]

Depending on how much condition he is lacking, I'd recommend Equitop Myoplast. Expensive, but you don't need it for long

 

[Ranyhyn]

Hillwork and some Baileys topline conditioning cubes?

 

[nemo_]

Thanks for the suggestions.
Kitsune - Unfortunately don't have any hills nearby

 

[Puppy]

Lunging in a pessoa? Along with feeding some high oil feed/Bailey's outshine.