Before trying this 30-minute walking treadmill incline workout, I had been rowing 10,000 meters every day for four months (which takes about an hour). I didn't want to lose my rowing endurance completely, so I cut my rowing workout in half (5,000 meters), and I'd do that before this walking workout. I found it helped to warm up my lower back, glutes, and hamstrings for the steep 12 percent incline.
After getting off the rower, since I was already warmed up, I did a a couple minutes of stretching before getting on the treadmill. I did Down Dog and Arching Three-Legged Dog to stretch my shoulders, hamstrings, and calves. And to open my hip flexors, I did Lizard and Twisting Lizard.
Then I'd hop on the treadmill and warm up a little. I'd walk with no incline at a pace of 2.0 mph for a couple minutes, then I'd increase the incline to 12 for a couple minutes, and then I bumped up the pace to 3.0, started the workout on my Apple Watch, and went for 30 minutes.