Oh I highly doubt this horse will ever be “chubby” LOL… But I hear you.
You make a good point - it’s hard to get a horse muscled up without work. Which is why a bunch of us suggested a good lunging/long-lining program with poles/cavaletti. The key is to work her in a manner that will encourage her to stretch and work over her back as much as possible. She can lunge her for hours a week for months on end, but if the mare goes around with her head in the air, back dropped and tense, nothing much will happen except she’ll have great lungs and some butt muscle, possibly.
And as far as hacking at the walk - that’s great… for other breeds. I tried that with my looky, alert Saddlebreds too and quickly found out that it’s the furthest thing from relaxing/topline building because they spent the entire hack with their heads in my lap, gawking at everything (not in a spooky way, just… looky/alert), with occasional snorts and scoots, and their backs were rock hard and dropped the whole time. Didn’t matter if i floated the reins at them - head and neck remained in my lap.
So i personally scrapped the idea of hacking as part of a young Saddlebred’s training. At least at first, I started back up when the topline muscle and the balance were there.
@AdultEmmy - I totally get your back-n-forth’ing on this. But the vet’s recommendation could very easily not be taking into account the breed’s tendencies, and when suggesting low-key walking and some trotting, is probably picturing a stock horse or a warmblood or anything else walking along in a long, loose relaxed frame, which absolutely WOULD be ok… but that’s not how Honey is going - she is inverted and is using her head and neck to “brace” under the weight of your friend (who is indeed a lovely rider, btw, so no slight against her).
Even 5 min of that could undo any positive work you’ve achieved over the week…
Wanna know how drastic the effect can be? I’ve had situations where my mare got startled by something while being massaged and just the act of spooking in her stall, dropping and holding in her back and having her head in the air for … 5-6 seconds, maybe…?.. made her tense up so much that my EMT had to do her back all over again.
A lot of vets aren’t familiar with Saddlebreds and their unique challenges/strengths. I once had a vet tell me my horse should be dead lame considering the extent of an injury - the mare was sound as a dollar (vet confirmed this as i was handwalking and was gobsmacked). Vets often underestimate how tough/stoic our breed is.
So anyway, I totally understand your dilemma. Do what you wish with this info. Either way it’s obvious you want to do right by the mare, and that’s half the battle.