At least we know he won’t be a strongman leader. Mayoral frontrunner Zohran Mamdani struggled to execute a single unassisted bench press rep while trying to impress a crowd at the annual Men’s Day open streets event in Brooklyn Saturday. Photos showed the 33-year-old Socialist, and Democratic Party nominee, was unable to lift a bar loaded with what was said to be 135-pounds off the rack without help — and his two reps required full assistance from a smiling, large-biceped Men’s Day celebrant, photos showed.After throwing in the towel, Mamdani stood up and gave all the credit to the spotter,...