Ian Bogost, guest editing at Kotaku, shows off his copy of “Jack LaLanne’s Physical Conditioning,” a tape-based game for the Intellivision. Published in 1979, he guesses that it may be the very first “health” videogame.
No screenshots, but I imagine the first challenge simply prints on the screen: “Tow boat across nearest harbor using only your teeth.”



If it’s a cassette, then this would be for the Mattel Aquarius add-on for the Intellivision.
Because, I find it hard to believe that my complete collection of Intellivision-related gear would be missing a cassette interface and I’m pretty sure there was never an Arcadia Supercharger made for the Intellivision.
It’s not a videogame, per se, but it may be preceded by an 8-track cartridge for the 2-XL, which is one of my favorite childhood toys. I don’t think I had the one in question, and I doubt there was much more than a simple few exercises, but it had to have possessed some pseudo-interactivity, which puts it in the right ballpark.
That is certainly not for the Mattel Aquarius Computer. No software for the Aquarius would use the word “Intellivision,” since they were completely separate and non-compatible formats. Instead, this is likely a tape for the original Intellivision Keyboard component. The keyboard component had an integrated tape drive, but was only released in limited numbers until the project was replaced by the ECS computer add-on.
That is certainly not for the Mattel Aquarius Computer. No software for the Aquarius would use the word “Intellivision,” since they were completely separate and non-compatible formats. Instead, this is likely a tape for the original Intellivision Keyboard component. The keyboard component had an integrated tape drive, but was only released in limited numbers until the project was replaced by the ECS computer add-on.