If you’re worried that your man juice is running on low, go swing a kettlebell at the gym or join your mate for a run at the beach. Those who lifted weights or spent time exercising outdoors were found to have higher sperm concentrations than men who don’t, in a new study. Men who worked out for more than an hour and a half outdoors each week, showed to have a 42% higher sperm concentration compared to those who don’t. There was a 25% higher sperm count in guys who spent two or more hours a week pumping iron compared to those who don’t, according to the preliminary research. Here are some more ways to help Protect Your Sperm Count.