Besides the Air Changes lesson Ian recommended you can do one minute changes with one chord.
Fret a chord any chord strum lift your fingers off the fretboard but don’t move your hand. Place your fingers back down all at once. When this becomes easy do the same thing but move your hand then fret the chord again placing all fingers down at once, repeat until this becomes easy. Then do the same thing but touch your knee then replace your hand to play the chord all fingers down at once.
Just remember to make it fun.
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