Take a 5 gallon pail with you to help you up. I'm new to this aging and inflammation thing (hate it!) and found when everything stiffens and to get off the ground, a 5 gal pail is a huge helper to standing back up again.
The hardest for me is when my mind would like to get it all done and I used to weed all day long. But I'm slowly getting it through my noggin that a bit each day is where it's at. A bit each day is more productive than all at one shot and not being able to move for days later because I bullheadedily pushed myself.
Pacing can be your friend!