Joe, I'm pretty sure that "pew aerobics" refers to the aspects of "high-church" or "Anglo-Catholic" Episcopal liturgy that are most similar to Roman Catholic practices ~ sitting, standing, and kneeling on cue. Except that standing is always an acceptable alternative to kneeling for Episcopalians who claim any degree of knee trouble.

Items on the list of "reasons I'm an Episcopalian" that could just as easily be reasons for being a Catholic include:

10. No snake handling.
9. You can believe in dinosaurs.
6. Pew aerobics.
5. Church year is color-coded.
4. Free wine on Sunday.
2. You don't have to know how to swim to get baptized.

The above features differentiate Epicopalianism from other Protestant denominations, but not from Catholicism. Only a smaller number of the cited "reasons" contrast it with the RC Church:

8. Male and female God created them; male and female we ordain them. (obvious major difference)

7. You don't have to check your brains at the door. (I realize that most liberal-intellectual Catholics would argue this point, but the Vatican does tell you what you're allowed to believe, at least to some extent, while the Episcopal Church recognizes that people will only believe that which they personally find plausible. In the words of Fr. Bill Terry, "We teach that Jesus died to take away your sins, not your brains.")

3. All of the pageantry - none of the guilt. (Well, most of the pageantry and as little guilt as possible...)

And the Number One reason to be an Episcopalian:

1. No matter what you believe, there's bound to be at least one other Episcopalian who agrees with you. (See #7, above)