Box Jumps, Burpees, Double Unders Workout

1st:

5 min AMRAP:

box jumps 24" x 5
burpees x 5

2nd:

5 min AMRAP: Double unders

results: 8 rounds on the first part and 190 on second. My double unders are getting away from me and my arms are getting way too wide. I need to get this back