The casting feature doesn't seem to be working for me as it should. My laptop seems to cast correctly to my TV but all my TV shows is a black screen with a white Chromecast symbol. Any help is appreciated as doing the workouts via my TV is a much better experience than having to use my laptop. TYVM!
P.S. I'm able to use the casting function via other websites.

Hello, I am also experiencing this casting issue and hare had to stop watching. Thanks in advance for any help with this issue.

I was able to cast but had issues playing the videos, after switching from internet connections...still an issue. Since I have a smart tv..I went on the internet link on my tv and logged in to the tv yesterday th the radcrew.vhx.tv link ...no lag, its perfect. I would suggest the same if you are having issues with the internet stopping and starting.

Thank you, Andrea. We recently got a smart TV so this is all new to me. I'm accessing videos like you (and RR's site) suggest, via my TV's internet browser and it's working very well. I find it easier to cue up the video on my laptop first then access it via TV, am happy with the experience so far. 😃