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Jennifer Lopez jloworkout2.jpgPhotos courtesy Self.com

Check out Jennifer Lopez exercise - on the bike and on the beach!

J.Lo is set to have a super-busy weekend, that's for sure! Self Magazine is throwing the mother-of-two a big bash on Saturday night, in celebration of Lopez participating in her first triathlon in Malibu on Sunday (along with Matthew McConaughey!)...

Get ready to see the singing sensation run, swim and bike! But what about that birthday party Jen's throwing hubby Marc Anthony - in NYC, no less! - on Sunday night? In Touch reports that Marc's 40th b-day bash (Jen "planned every detail," says a pal) will take place at the Bowery Hotel...

Guess J.Lo better hop a plane to New York right after finishing the triathlon if she plans to make it!