@summera1 Three times per week I was jumping/dropping off a 12 inch (30 cm) step and immediately jumping as high ask I could. I was doing this 40 times in 4 sets of 10 drop jumps. That was a total of 120 "double jumps" each week.

Key from Osteo-Gains that makes a difference for me are: 1) put 5 seconds rest between each double jump 2) take a 30 second rest between each set of four double jumps 3) only do 20 jumps per day. These rests and limitations are because your bones start ignoring forces after that. Osteo-Gains also does both jumps from the floor, but I think that I will still try to jump down from a rise for my first jump in each pair of double jumps.

Here is one of the many references that was guiding my practice:
https://melioguide.com/weight-bearing/jump-training-osteoporosis/
My key osteoporosis bad T-score is in my left femoral neck. I suspect this is in part due to decades of favoring my left leg against big or sudden forces due to osteoarthritis in that knee. Impact is the only exercise with some hope for improving BMD in the neck of the femur. Of course my knee objected to the drop jumps also, but my future-surgeon said that I could not do actual damage to it this way.

Thanks for asking Summera1.