Stretch frequently throughout the day. Don't force your body to conform to its workspace. Habitually poor posture will cause increased aches and pains. Combinations of awkward posture, force, repetitions, and insufficient rest periods are a set up for injury. Become aware of mounting stresses, aches and pains.
Endurance remains similar.
Remember - no single technique will work in all circumstances. Push don't pull. The safe lifting zone is between knees and shoulders. If the load is below knee level - bend your knees and lift with your legs. If the load is above your shoulders - use a stool or ladder.