Giants cornerback Aaron Ross says his troublesome hamstring is back to 100 percent and he’s eager to join the Giants’ offseason workout program when it opens on Monday. “With guns blazing,” he said. “I just wanted (the hamstring) to heal on its own and get back to 100 percent, and I feel like that’s where I’m at right now,” Ross told the Daily News. “I’ve been running on the beach. The sand is a true test for the hamstring because your leg is sinking in the dirt. I feel like I’m 100 percent and ready to go again.” Ross played in only four games for the Giants last season after first tearing his hamstring in early August. Three times he tried to come back from the injury, only to end up making it worse and landing on injured reserve on Dec. 31, though the last game he played was on Dec. 13.