I'm late-30s. About to start working on a personal project involving cement: making planters for small fruit trees. The reason: to learn more about cement, si

I'm late-30s. About to start working on a personal project involving cement: making planters for small fruit trees. The reason: to learn more about cement, since my plan is to set up concrete piers for a future cabin. And, to eventually learn masonry for making a concrete + rock house. I do have a bit of back pain already from a desk IT job. However I am relatively fit and I think with more calisthenics I'll improve my back & ab muscles to reduce my back pain.