I used two programs to download these clips. First, you need a rtmp sniffer, I used a Python script called rtmpSnoop (You are not allowed to view links.
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Login). You run this script before playing the rtmp video you want to download. The script gives you a couple of paths that you'll need to use as parameters for rtmpdump (You are not allowed to view links.
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Login). In the end, the command you run to get rtmpdump to start downloading looks like this:
rtmpdump -v -r "rtmp://vod.koc.hscdn.com/koc/_definst_/mp4:mp4:ksports/2010/6/20100626_2010년 미스터_미즈코리아_여일반_01.mp4" -y "mp4:/ksports/2010/6/20100626_2010년 미스터_미즈코리아_여일반_01.mp4" -W http://tv.sports.or.kr/org/bodybuilding/view.jsp -o output_video.mp4
There are tutorials on YouTube that show how to download video with rtmpdump, so you can watch those if you need more help.