Oscar Pistorius -- On the Run

Oscar Pistorius returned to doing what he loves recently -- running on a track on a beautiful day with the sun beating down on his face ... while the girlfriend he shot to death is still dead.

Despite the fact he admitted to shooting Reeva Steenkamp back in February, the judge granted the former Olympian bail ... allowing him to roam around South Africa like a regular non-killer person.

Oscar was pictured jogging on a track at a university in S.A. on March 24.

Pistorius -- who's been charged with murder -- says he doesn't intend to compete in any races ... but reps for the runner say family and friends have encouraged him to continue training because they believe it will help him cope with the trauma.