God do I have to do everything around here?
Julian's advice is good except it doesn't teach anything.
Lifting with your 'knees' is also good advice, but what does it mean?
What you do is bend at the knees, grab the whatever, and then stand up. Your back should not 'round' and at best should be leaning forward, but with a neutral spine position
I don't remember your posture or if I even figured it out from your pics...hmm...sec
oh whatever. however you naturally stand, your back should not deviate too much.
Arching your back forward or backward is dangerous.