I was worried about the agility/heart rate thing too, as were all the guys I was in phase 1 with, but it turned out to be nothing to worry about and we all passed. They don't rush you through the test, so just take your time and let yourself relax and breathe between each different test. My "fail" heart rate was about 157 and it never got above 102, and I'm 45 years old, in fairly decent shape, don't work out at all and I smoke a pack a day. You'll have no problems.