Michael Wacha hopes an offseason weightlifting program strengthened the muscles in his right shoulder and will prevent another shortened season. ''All I can really say is that my arm just feels good right now,'' Wacha said Wednesday after allowed two hits in three scoreless innings during the St. Louis Cardinals' 9-3 win over Washington. Now 25, Wacha was 4-1 in the postseason as a rookie in 2013, and he was selected as the MVP of the NL Championship Series MVP after shutting out the Los Angeles Dodgers for 13 2/3 innings and earning two wins.