HURT TO HART!

Wobbly Wagner's deadly workouts

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SMALL-SCREEN star Robert Wagner continues to push the limits with his workouts, but sources say friends fear the frail 95-yearold widower of the late Natalie Wood is doing too much and risking serious injury or worse! "People around R.J. say it's great he's still exercising at his age," tattles an insider.

"But R.J. thinks he's invincible like he's Superman." His stepchild Natasha Gregson Wagner, 54- daughter of Natalie and then-hubby, director Richard Gregson shared an Instagram video of him huffing and puffing at the gym, switching from one exercise to another, his face pink with the effort.