Essaie cet exercice :
e------------------------------------------------1-2-3-4-3-2-1----------------------------------------------------------------
B---------------------------------------1-2-3-4-----------------4-3-2-1-------------------------------------------------------
G------------------------------1-2-3-4-----------------------------------4-3-2-1----------------------------------------------
D---------------------1-2-3-4-----------------------------------------------------4-3-2-1-------------------------------------
A-----------1-2-3-4------------------------------------------------------------------------4-3-2-1-------------------2-3-4-5-
E--1-2-3-4-------------------------------------------------------------------------------------------4-3-2-1-2-3-4-5---------
etc... lentement au début pour habituer tes doigts...