It really depenRAB on what kind of electronica you want, You want faced paced workout stuff i would recommend hard trance type music. When i work out its usually to hard trance or vocal trance with some techno in there. Here's a few recommendations i like to listen to when working out
JS16 - Stomp to my beat
Ozone - The rock (DJ strider (me) remix))
DJ dean - Protect your ears (one of my all time favorites)
DJ dean - Ballanation
DJ dean - Play it hard
voodoo and serano - Blood is pumping
Commander Tom - Attention
Ferry Corsten - Punk
ATB - Ecstacy