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By Jeff Roberts
Answer: LOLL

Each clue points to a specific class in the MIT Physical Education Course Catalog. Enumeration is given to help narrow down the possible clue answers and to confirm the exact course title. The first letters of the clues suggest that you need to use the course numbers. When you subtract the given number from the PE course number, you get a series of numbers that convert easily to letters, spelling ANSWER IS LOLL.

Cartilaginous fish, in the middle? (5, 12) Skate, Intermediate
PE.0613 minus 612 = 1 (A)

Oscillating playground apparatus (5) Swing
PE.0317 minus 303 = 14 (N)

Unification of rhythmic movement? (5 6) Dance Fusion
PE.0318 minus 299 = 19 (S)

Rummage (through) (5) Rifle
PE.0626 minus 603 = 23 (W)

Spherical fermented vegetable? (10) Pickleball
PE.0646 minus 641 = 5 (E)

European Car of the Year in 1992 and 2013 (4) Golf
PE.0604 minus 586 = 18 (R)

Net travel metasearch site (5) Kayak
PE.0907 minus 898 = 9 (I)

Unrepresented legal response AWESOME? (4-7 3) Self-Defense RAD
PE.0611 minus 592 = 19 (S)

Mexican condiment (5) Salsa
PE.0308 minus 296 = 12 (L)

Bahraini or Israeli, e.g. (6 7) Middle Eastern
PE.0306 minus 291 = 15 (O)

Elongated starchy vegetable, as a starter? (6, 8) Squash, Beginner
PE.0616 minus 604 = 12 (L)

Reselling stolen goods, like food wrap? (7, 4) Fencing, Foil
PE.0602 minus 590 = 12 (L)