Bears move at 40 feet on all fours, but only 20 if they try to move on their hind legs.

Your strength, constitution and dexterity increase by 2 but your intelligence and charisma decrease by 2.

You count as one size larger when determining your carrying capacity and the weight you can push, drag or lift.

You have thick skin protecting you, you get +2 AC while unarmored.

As a bear you gain 60 feet of darkvision.

You have advantage on Wisdom (Perception) checks that rely on smell.

Due to your size and diet you have proficiency in the Wisdom (Perception) and Charisma (Intimidation) skills.

During your attack action you can strike twice with your claws for a total of 2d6+ strength mod slashing damage.

As an attack action you can bite your enemy for a total of 1d8+ strength mod piercing damage.

You understand common, but you cannot speak or write it.
You can communicate simple ideas with other animals.