Rear Barbell Lunges and 400's on Treadmill

Barbell Rear Lunges (Front Rack position)
45 x 8
95 x 8
115 x 8
135 x 8
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Treadmill 400's x 6 with 0.10 walk rest
Interval at 10.0/6.0 mph/1:30
Rest at 3.5mph