Notices A preconception class, covering many aspects of prepregnancy care, will be held on Tuesday, Jan. 24, from 6:30 to 9:30 p.m. at the Johns Hopkins Women's Health Center at the Galleria Towers in Lutherville. Cost of the class, which is sponsored by the Johns Hopkins Nurse-Midwifery Service, is $10 for individuals, $15 for couples. A copy of the Midwife's Pregnancy and Childbirth Book is included in the fee. Preregistration is required. To register, or for more information about this and future classes, call 955-4094. Session III of the aerobics classes sponsored by the Center for Occupational Health and the Office of Student Activities is planned for January. The classes are open to staff, faculty and students. Morning Fat Burner-- Monday/Tuesday/Thursday 7:15 to 8:10 a.m. Cost: $30 Toning Class-- Monday/Tuesday/Thursday 8 to 8:50 a.m. Cost: $20 Advanced Body Blast-- Monday/Tuesday/Thursday 7:15 to 8:50 a.m. Cost: $35 Evening Meltdown-- Monday and Thursday (Jan. 12-Feb. 2) 5:45 to 6:30 p.m. Cost: $25 The classes will be held in the ROTC band room, located behind the Athletic Center. To register or to get more information, call Fran Humphrey at 516-0450.