Running
Men and women can wear each other’s shoes especially the ones that are styled as unisex. The primary difference between a man’s and a woman’s shoe design lies in the Length. A size conversion of 1.5 can be applied to make up for the design difference.
When comparing all triathlon distances against a marathon, then clearly triathlon is more challenging considering that the Ironman distance also hosts a full marathon distance, however, when comparing Triathlons to Ultra Marathons, the scale shifts to Ultra Marathons.
You should know the rules to avoid being penalized or worst, disqualified. Rules such as, not running with a bare torso, not crawling during the run leg, and not holding onto still objects for support while running. You should also avoid running barefoot.