1 Hour Dumbbell Upper Body Strength Workout | Back, Shoulders, Arms, Chest | Built 15 - Day 13

Today’s workout is a 1-hour total upper body strength session using dumbbells only. We’ll move through five focused blocks targeting the back, shoulders, biceps, triceps, and chest, then reverse the order and increase interval times to push your endurance and build real strength. Get ready for a powerful burn across every upper body muscle group.

🔥 This is one of the biggest challenges yet — but you’ve got this!
✅ Trains all major upper body muscle groups
✅ Smart structure to maximize strength and endurance
✅ Dumbbell-only workout — perfect for home training
✅ Builds muscle definition and upper body power
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