I love IMAX 3. It's my favorite IMAX and one of my top 5 favorite Cathe workouts. Here are what the blasts are:
1 - Stradde taps, jumps on board
2 - Jump on step, turning squats, plyos
3 - Starbursts, plunge lunge
4 - Jumps forward, side, turn, tuck, richochet, jacks
5 - Plie jacks (my favorite but a lot of everybody's least favorite)
6 - Wide lunges from step
7 - Jumps on/off step
8 - Plyo, air jack, tuck, turning plyos
9 - Go across step, abduction and extension repeaters
10 - Jump wide on step, jump together, jump off and jump wide, wide squat jumps, airborne jumps.
Blasts 1, 4 and 7 are the hardest for me with blast 8 a close second. The recovery times in IMAX 3 are less than the other two. The choreography is also more complex. When there's a harder blast coming up, the step portion is easier (like in blast 5) and when the blasts are a little easier, the step is a little more intense. This one is really high impact, so be prepared.
Marcy