Let’s travel back to the Paris Olympics—the women’s marathon event in particular. Twenty kilometers into the race, Sifan Hassan of the Netherlands was holding her pace and biding her time.

For new runners, here's Ferguson's best tips, plus a speed workout to try at home. Throughout the 20-minute run, we both started to get breathy, but maintained a conversation, chatting about ...

Members of the 10IronWomen team spray paint their shirts with the Speed Project stencils. A decade earlier, Arend pitched an idea to a group of friends: What if we run from Los Angeles to Las Vegas?