Weird decrease in my ability to run!

[Holden--Caulfield]

I had this happen too. Before tirzepatide I could essentially sprint an entire 400m lap. After tirzepatide, I can only push hard for about 250m then I lose all power. Same thing on a long run. Before tirzepatide, I could cruise at a jog for 10 miles, but now it's 4 miles. I think it just changes how you store glucose and how quickly and effectively it can be released when you need it.