🏁 12-Week Beginner Marathon Plan – Singapore Marathon Focus This 12-week plan is designed for runners who have completed a half marathon and are stepping up to the full marathon distance—specifically preparing for the heat, humidity, and terrain of the Singapore Marathon. Each week includes a mix of easy runs, tempo/threshold sessions, long runs with fueling practice, and specific heat-adaptation strategies. You'll build endurance gradually while preparing mentally and physically for race ...