Construction, landscaping, and other heavy physical labor jobs often have folks who say they don’t need to train. The job itself provides the exercise, so strength training isn’t really a necessity.
I would argue against that.
If you work physically intense job, I think you should prioritize training during certain parts of the year. If it’s winter time and work slows down, treat that as an athlete would treat an offseason. A time to build a foundation and work certain aspects of your development that normally aren’t there. Focus on getting stronger with squats, deadlifts, presses, and rows. Do some conditioning with a prowler. When your work ramps up again in the spring and summer, you’ll be in a much better position to handle the stress than if you had done nothing all winter.
And when spring and summer arrive, scale back on your strength and conditioning. Try and train twice for maybe 35-45 minutes. Do a couple of movements each time (squat and press 1 day, deadlift and bench the other). It’ll help maintain your strength and won’t be too tough to recover from.
To get stronger, you’re going to have to lift some weights. And over time things will need to get tougher. If you can use some time of the year to build a good base of strength, you’ll ensure better health and better performance in your work.