Kramer takes up swimming. Finding the local pool too crowded, he begins swimming in the East River. On their first date, Hal tells Elaine he has been very careful about his back since injuring it. Later, he sends her an ergonomic mattress. Assuming he got it for himself, she is offended at the presumption of sex after one date and gives the mattress to Kramer. When she confronts Hal, he tells her that he meant the mattress for her use and even had it custom-made for her back. Charmed by this, she retrieves the mattress from Kramer, but he has fouled it with the stench of the East River. When he notices Kramer and the mattress have the same stench, and learns Kramer has the key to Elaine's apartment (to get the mattress), Hal thinks Elaine has been having sex with Kramer. Hal confronts Kramer privately to clear up his relationship with Elaine, and Kramer mentions that swimming in the East River has done wonders for his back. Hal tries it out and tells his back doctor, who prescribes swimming in the East River to all his patients, including Elaine, who threw her back out trying to move the mattress. As a result, Kramer finds the East River as unacceptably crowded as the local pool. Jerry is getting new kitchen cabinets. The contractor, Conrad, is excessively accommodating, asking Jerry for his preference on every aspect of the project. Weary of his questions, Jerry leaves the apartment and tells Conrad to do the cabinets however he pleases. Conrad builds a large and obtrusive addition to the kitchen that Jerry loves but all his friends hate. Jerry asks Conrad to put his kitchen back the way it was, disgusting Conrad with his fickleness. George likes to take naps at work, but his office has large windows looking into the hall, so he naps under his desk. George has Conrad modify his desk with a bed and space for an alarm clock. Steinbrenner visits George's office while George is napping and waits for him to return. Not wanting to expose his napping space, George gets Jerry to phone in a bomb threat in an effort to get Steinbrenner out of his office; instead, Steinbrenner hides under the desk. However, he assumes George was also hiding from the bomb. Steinbrenner puts George in charge of the "terrorist's" demand of a fitted hat day. George has Jerry call back and renounce the demand, then disconnects the call before Jerry can issue further demands. Fearing a reprisal due to the forced disconnect, when Steinbrenner hears George's alarm clock ticking, he thinks it's a bomb, and calls in the bomb squad, who dismantle George's desk. Craving the coziness of his desk bed, George takes a nap in Jerry's cupboards.