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Try squeezing one between your thighs when you're in Utkatasana (chair pose) and see how much more fire that creates in your glutes and core muscles.
I've been using the 3 inch size for many years and find it really handy, especially when it comes to relaxing my tight hip joints. By using it to sit on, it causes my pelvis to tilt in a way that straightens my back and makes seated floor postures better. I also like to weave it under and over my legs whenever I'm in boat pose because that gives me a more challenging abs workout.
I recently bought a 4 inch version to compare and while it's nice to have a variety of thicknesses, the thinner size is much easier for my small hands to grip.
Below you'll find my top picks in foam, cork and bamboo wood. The advantage of having at least two is that you can use them in tandem, side by side, or stack them for more height options.
I'm seriously considering adding a curved block to my fitness kit. I like how they mold to your palm and allow for some gentle movement when inverted.
Single 4 Inch Foam Yoga Block with Mandala Print
Natural Cork 4" Yoga Blocks 2 Pack with Elephant Design
3 Inch Yoga Bricks with Strap and Bag
Two Tone 3" Foam Yoga Blocks Set with Strap
Single Eco Friendly Bamboo Yoga Block 4 Inch
Pair of 3 Inch Foam Bricks with Workout Guide
Extra Wide and Slim 12 Inch Yoga Brick
Single Foam Workout Block with Curved Edges
Small Size 2.6 Inch Yoga Bricks Set of 2