Walling is Physical Work
A response to a recent question about working with and lifting stone.
A 30 minute stretch routine first thing in the morning is the best "back-helper" I know of.
Walling is physical work, so it tends to both build the body up and break it down at the same time. The hope is to stay on the healthy side of the balance.
If you're giving stonework a try, keep aware of how you're feeling throughout the day. Rest often by taking a walk away from the work. Stop when you feel the need to.