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A generation or two ago, many or most middle-aged people acted and looked old, stodgy, and even weary. This Youtube is good, re fitness for the over-50 set. It's not an ad for Crossfit but it does show what the middle-aged can do to keep on truckin'. I think the group experience adds something extra to it all, besides lowering the cost of the training:
Crossfit does emphasize some activities hat are not necessarily good for older folks, though: running is not great for aging joints and will tend to make one look older.
High impact interval training on a stationary bike is much more effective and better overall for older folk, says the 64 yr. old who does that every other day to great cardio effect and with far less impact on his joints.