Double Under/Lunge AMRAP

Warmup:
3x15 situps
3x15 burpees
muscle up practice

WOD: "Double Under/Lunge AMRAP"
AMRAP in 15 minutes of:

• 20 double unders
• 20 walking lunges

5 rounds as Rx

the 100 double unders slowed me down, although i am getting better at them