It's the warm supportive ambiance that keeps me coming back to this forum
Just ignore the lack of support .. they'll grow old disgracefully eventually.
I suffered from occasional back pains for a decade culminating in a very painful sciatica attack last March where getting out of bed was so painful I nearly cried.
I do yoga but clearly my back was not strong/flexible enough so I now do back exercises designed to strengthen the back muscles . They take about 60 seconds and I do them once a day, 5 days a week. No issues now.
I do, however, adhere strictly to other rules.
No stretching and bending over and lifting. This is the worst you can do.
No twisting and bending: this is the second worst you can do.
Always bend you legs when lifting: they are stronger than your back or arms.
Ensure you are warm. Lifting when cold pulls tendons and muscles which are less flexible when cold.
And specifically for beekeeping: set your hives at a height where lifting is easy... and the ground is flat and level. So adjust hive stands and ensure the ground is level. No big stacks of supers.
If you must turn with weights, turn your legs...
I lifted jumbo lang brood boxes this spring - about 50kg... with no problems... but was very careful. And rebuilt a pond and grovelled under cars and dug things.. so exercises seem to have worked..
I have TBHs as well as langs... easier to handle.. but you occasionally have to move a full hive,, where help is essential.. 150kgs for a full one.. and big TBHs are unwieldy..