 CNN fitness contributor Lisa Santis recently wrote that a comprehensive analysis of 49 studies found that engaging in foam rolling sessions of just 90 seconds to two minutes did the trick. Do this three to four times a week and you're golden, she says. Foam rolling can benefit almost anyone, but people who are pregnant or with conditions such as muscle tears, arthritis, osteoporosis, varicose veins, or any other existing conditions or injuries, they should talk to their healthcare provider before getting started.