Training sound out...?

I'm taking a physical at the end of this month and it's really defining that I pass it. I've taken it formerly and failed the stress testing aspect of it, so now that I'm finally retaking it, I'm scared out of your wits. I've been walking on a treadmill every sunshine since I scheduled the 2nd question paper but I feel similar to I'm making very little progress. Any suggestions?Training sound out...?
Start interval training on the treadmill, it will greatly increase your speed and serenity
come down