Forget squats — these 4 glute bridge variations will build your backend

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Want to challenge your core muscles This 5 move, 30 move ab and core workout is perfect for building strength and definition without the need for any equipment

You don't need planks to build and strengthen your core; just try these three moves at home instead

Strength training can help you get stronger, faster and more injury-resistant as a runner, and this 35-minute dumbbell workout hits all the key areas you need for the

The 255 and 955 may be three years old, but the internals remain rock