15 Double-Unders
1 Knees to Elbows
14 Double-Unders
2 Knees to Elbows
13 Double-Unders
3 Knees to Elbows
12 Double-Unders
4 Knees to Elbows
11 Double-Unders
5 Knees to Elbows
10 Double-Unders
6 Knees to Elbows
9 Double-Unders
7 Knees to Elbows
8 Double-Unders
8 Knees to Elbows
7 Double-Unders
9 Knees to Elbows
6 Double-Unders
10 Knees to Elbows
5 Double-Unders
11 Knees to Elbows
4 Double-Unders
12 Knees to Elbows
3 Double-Unders
13 Knees to Elbows
2 Double-Unders
14 Knees to Elbows
1 Double-Unders
15 Knees to Elbows

Looks long but it shoundn't be too bad.

Have fun, Getting it done!