As a fisherman with back problems I have a few suggestions.Try elevating one foot when you're standing, put it on a higher spot such as a tackle box,bait bucket etc.....Switch feet every so often.Another one is stretching,bend over at the waist and let your arms hang down-hold this position for 30 sec. and repeat 5 x.Many others available just ask-good luck.

the fishermans back medic