I lifted heavy bins today, for about 10 - 15 minutes, have done light housework for about 1 hour and 10 minutes, my steps are right on track, too. I'm hoping for a 10K day, if I can, or at least 8K - 9K. Anything over 6K is good, for me. My back's sore from heavy lifting and sitting in the car yesterday and at Dson/Ddil's, too. Icy Hot helps tremendously, as does a hot shower.
I've found, since I have degenerative disk disease, osteoarthritis and scoliosis in my lumbar region and sacrum, how standing pelvic tilts help immensely. I went to You Tube, several years ago, to watch a video demo of how to do them. They also showed them laying down flat on a mat. One thing, which helps a lot, is when I get down on my 2" thick mat, do my back PT exercises and Pilates exercises. Oh, my! It's like getting a massage!
Also, if I put my back to the wall, stand with my feet out about 1 foot, then put my back flat on the wall, inching down a bit, and then hold it there, with my back flat against the wall, it's very comforting and therapeutic, too. The inner thighs, and upper thighs and buns get a good workout, too. It's a good thing, as Martha would say. 
