Debunking a myth!
Good job with the exercise! And you know you don't have to go too heavy with it to make a difference too!
As for the alf-alfa.. there are a lot of people who will say alf-alfa is too rich for digest and can cuase serious issues. If you have a horse that hasnt been exposed to grains or feeds with more nutriant rich formulas then you would want to introduce it lightly and work up to it. But surprisingly enough, would you believe in most parts of southern california, Arizona and Utah, grass mix is not an option from sellers? You can't get anything but alf-alfa from feed stores or suppliers. Grass mixes are a harder produce to grow in the less then wet regions. While living in the Mojave, there wasnt a feed store around that would supply a grass mix of any kind. Horses have been fed on it in various places and conditions without problems. Generally horses in specific who have diet issues are the ones that have digestion problems and alf-alfa is an only option they can consume. The problems I have seen when it comes to feeding alf-alfa and the horse going south on it, comes from free-feeding. Some really can't handle it, and then having cart-blaunch to it causes problems. I suggest that anything new you introduce you start lightly on, and work up from there!
Dixon's Red Hot Ember