These accessory days are excellent for a ton of blood flow as well as creating muscle fatigue. I try and keep all my rest times limited and really focus on that "mind muscle connection". Focus on each muscle I'm trying to use, really think about the contraction, the eccentric, the stretch...all that good stuff.
Upper Accessory Day
A. DB Decline
4x15 w/ 90lb DB
B. Machine Close Grip
4x15
C. Light Barbell OHP
4x15
D. Rev Grip Pushdowns
4x15
E. Parallel Grip Pull Downs
4x15
F. Rev Barbell Curls
4x15
I always feel fantastic after these workouts. I'll either walk on the treadmill of stairmaster for about 10 minutes and call it a day.
Lower Accessory Day
A. Leg Press
4x10
B1. Leg Extension
4x10
B2. Leg Curls
4x10
C. BB High Pulls
4x10
D. Banded Walks (doubled mini band)
Forward, Backwards, Lateral
20 steps each
E1. Hanging Leg Raise
4x12
E2. Planks
4 45 second holds