Mild aches rather than sharp pains? Put down the frozen peas – researchers say icing sore muscles may delay healing. In a study from the Journal of Strength & Conditioning Research, men who treated exercise-induced muscle damage (EIMD) with an ice pack recovered slower – and felt more muscle fatigue – than the control group. Icing helps heal bona fide injuries by reducing blood flow so cutting inflammation. But it seems this isn’t helpful during EIMD, when your body is trying to flush waste products away from muscular microtears – so chill’s out.