Procreating—at least for the time being—is sort of like rolling the dice. Eye color, hair color, athletic skills, blood type; there’s no telling which genetic codes are going to sync up to construct your offspring. But you can make some lifestyle changes to boost your fertility and the odds of having a healthy, happy baby. Because while talk of infertility usually centers around women, the truth is that “half the time a couple has trouble conceiving, there’s an issue with the guy’s sperm,” says Joseph Alukal, M.D., Director of male reproductive health at NYU Langone Medical Center. (No matter that “1800 sperm are produced every time your heart beats—it’s nature’s most remarkable assembly line,” adds Alukal.) Here, seven ways to make sure all of your swimmers are sharp shooters.