Negative Parallel Bar Dip - Bent legs?

i don´t have a horse at home, but have some bars (like this http://www.strengthwarehouse.co.uk/index.php?main_page=product_info&cPath=107&products_id=480) - but with this little height i can only do the dip when my legs are bent and not straight as shown in the video. Is it ok to do so or what else can you recommend? 

is it possible to perform HBP in foundation 2 without a horse?

Thank you

Jochen

30 minutes ago, Jochen Friedrich said:

Is it ok to do so or what else can you recommend?

Bent knees are totally fine Jochen. Just be sure you keep your torso upright/vertical. 

HBP in F2 requires a single bar, like a pull-up bar, parallel bars, and rings. 

Thank you very much Everett