I made a parkour map where the person is small and the jump is short , you have to overcome the obstacles and reach the finish line , taking into account that you have half a heart meaning any small or big hit will lead to your immediate death , This is the second part of the map. I added more content and the challenges became a little more difficult than before.

Character minimize commands:

/attribute @p minecraft:scale base set (value)

To change the speed:
/attribute @p minecraft:movement_speed base set (value)

To change the size of the jump:
/attribute @p minecraft:jump_strength base set (value)