The short answer to your question is YES. Your leaders will provide you purpose, direction, and motivation to keep up with your physical fitness levels. The army gives incentives for those soldiers that strive to score high on their physical fitness test (awards, promotions, days off, etc). Each unit has different ability groups to challenge each person. Each unit also provides a physical fitness training calendar so dont believe everything you hear - it is probably those losers that are telling you this because THEY slacked off. PT is all what you put into it. You will be the master of your own physical challenges.