Roll and Stamina Add-on 1.21+

The quite entertaining Roll and Stamina mod introduces new mechanics to Minecraft PE. The character gains the ability to perform flips, as well as having Stamina, which decreases during sprinting and prevents fast running when fully depleted. There's also the possibility to slow down when taking damage.

Flip:
Single press of Crouch (not holding it)
Can jump back or forward, as well as 3 blocks up
Direction depends on the direction of movement

Stamina:
Consumed during running, jumping, or flipping
If stamina runs out, the player will not be able to run

Slowdown from taking damage:
When taking damage, the player slows down for a few seconds
Does not work with magical damage

Changes in the new version

Climbing will not automatically turn into crawling if there are small gaps nearby

Smart crawling can be activated when the player moves in any direction