January 1991: Are you over-trained and under-rested?; Combatting gastro-intestinal problems; Special report: sudden death in running; New research into treating lower- back pain; The facts about exercise and cholesterol; How low-level exercise improves mental health; Exercise helps bring down blood pressure; High-impact exercise can damage hearing; Fish oils can boost fitness; Ignore these heart warnings at your peril; Why you should avoid a total layoff; Are you allergic to exercise?