I made my best arm gains with 5-minute daily workouts: Build your biceps with this 100-curls-a-day challenge

Fitness creator Jack Wiltshere credits 100 daily curls with his best-ever arm gains ...
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I'm a 54-year-old personal trainer—this is my go-to 5-minute arm finisher for building lean muscle

If there’s one person you can trust to help you build muscle, it’s Caroline Idiens. The 54-year-old PT, better known by the name of her wildly successful fitness platform, Caroline’s Circuits, coaches ...

No Time to Exercise? This 15-Minute Full-Body Workout Builds Strength Fast, According to a Personal Trainer

You’re never too busy to work out—really, it’s true! Personal trainers say that all you need is 15 minutes to get a full ...