Hi,
The resolution of the downloads differs per series, as older videos were shot at lower resolutions (although they were state-of-the-art at the time!). All of Cathe's current videos are only available for download at 720x400 in widescreen. All the newer videos were shot in 1080i resolution, but unfortunately until technology can catch up to reliably deal with download sizes of over 5GB per workout, we are holding back on releasing the digital videos at that resolution. We can say, though, that upon comparing the 720x400 videos with the 1080i videos on our 60" screens here in the studio, the actual difference in perceived quality is quite minimal.