Congress should craft a regulation requiring Federal law enforcement officers who are paid to protect the public be physically fit enough to hold that position. LEOs are paid for the 0.01% of their time when it is necessary to fight a criminal or chase a fleeing felon (a.k.a. protecting the public). If they can't physically perform during that 0.01% of the time, they shouldn't be paid.
Out-of-shape LEOs are more prone to illness, disease, on the job injury and are less physically capable, requiring more officers to make an arrest or man hours to track down a suspect who evaded arrest.