Sarah and Dimity help Erica from Illinois ease into a half-marathon conservatively—then the duo debates what’s the best mile-marker to step on the gas. They talk acclimatization (easier to spell than to say, as you’ll hear!) in response to a question from Marianne in New Jersey. The BAMRs provide Julie with blister-prevention advice, then go through a range of speed-building tactics for Jamie in St. Louis, who is transitioning from marathon training to tackling shorter summer races. Freshen up your running gear with a Mercury Mile box: Take $10 off your stylist fee by using code AMR at checkout at MercuryMile.com Go to ThirdLove.com/amr to find your perfect-fitting bra—and get 15% off your first purchase! Get 20% off your personalized performance sleep products with code AMR at Bedgear.comLearn more about your ad choices. Visit megaphone.fm/adchoices