These CrossFit® workouts will help you to test and improve your strength and build muscle. Real strength and muscle is build gradually over time in line with intelligent programming, but its always a good idea to keep your body guessing and stress it in new ways.

Source: CrossFit Inc
20 Tough CrossFit Workouts to Build Strength and Muscle
From workouts for Spartans to testing your total, there is something for everyone with these hard Crossfit workouts.
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