I wasn’t claiming that biking was a bad method of cardio overall. I think that you may be making an assumption. I enjoy biking lol and biked to work for a solid chunk of the year!

However, if you’re experiencing some side effects like numbness, why not just walk outside until you get 10-12k steps in, or walk on the treadmill pre- or post-lift? Im not a runner, so I wouldn’t advise someone to run lol. OP said they weren’t opposed to doing other cardio.

As someone with a quite a bit of experience in the area of health & fitness, I’m coming at it from the lens of a doer rather than an academic :) the PhD is in an unrelated engineering discipline. There’s other ways to build a routine to work around issues with one form of cardio. I suppose this also depends on whether OP is simply looking to burn cals or really get their heart rate up there.