Tight Cheeks Workout

Today I'm doing the Tight Cheeks Workout.

18-20 minutes, 4 exercises

Part 1 - 4 minutes, 6 Rounds of 10:30 Intervals, max effort
1) Sandbag Swings (alternating arms)

Part 2 - ?? minutes, (4-6 minutes, I'm guessing)
2) 25 Reps (each leg) One Leg Half-Squats with Balance Ball

Part 3 - 4 minutes, 6 Rounds of 10:30 Intervals, max effort
3) Forward/Backward Lunge (alternating legs)

Part 4 - 6 minutes, 6 Rounds of 5:25 Intervals, max effort
4) Balance Ball Combo for Butt & Core

I'm going to follow up with 20 minutes of walking on the treadmill at a moderate pace. As usual, an update with my scores will follow when I'm done with it.

Done! Here are today's scores:
Round 1 - 15, 15, 15, 14, 13, 14
comments: done with 18lb "core ball"

Round 2 - 2:10 right leg, 1:40 left leg
comments: done with 18 lb "core ball," very hard to balance on my right leg

Round 3 - 6, 5, 4, 4, 4, 4
comments: done with 18 lb "core ball"

Round 4 - 3, 5, 3, 6, 3, 6, 3, 7, 3, 7, 3, 4, 8
comments: 5 sec time interval too short for switching positions, if I had it to do over I would use 10:30 intervals