Lindsay Lohan Faints During Workout

According to Heat magazine, the almost 19 year old, passed out while spinning.

According to witnesses, Lohan (Mean Girls, Freaky Friday, Herbie: Fully Loaded), became pale, and began to gasp, before fainting.

Within moments, the staff and her exercise partner came to her aid.  After a few minutes, Lohan regained consciousness. 

Lohan has had some health problems recently.  Last fall, she was hospitalized for pains she was feeling in her chest.  She was diagnosed with extreme fatigue, and needed a couple of weeks of rest to recover.