[78-L] music for exercising

[Donna Halper]

I just found an advertisement from mid August 1922 for Victor 
Records-- it was in a number of newspapers.  It advertised a 
"Portable Victrola No. 50" and a set of exercise records.  As you all 
know, I am not an expert in the machines of the 78 era-- so, was 
there a portable Victrola number 48 or 49, or was 50 just a brand 
name?  Also, what  were the records that went along with the 
record-player?  The ad says the records were specially designed to be 
used in an exercise regimen-- but it doesn't explain what songs they 
were.  It just says they will enable people to "Exercise to 
Music".  The records are only described as "three double-faced Victor 
Records for Health Exercises," sold in a "compact container" and 
planned by an (alleged) authority named Professor Charles H. Collins. 
Any further explanation would be very interesting for me, and I'd 
appreciate it.