upper body weight training

elliptical stepper 15min
treadmill walking 3.5-3.8mile/hour 10 min

Chest press (45lb 15X2 40lb 12X1)
chest pull(55lb 15X3)
arm curl (10lb 12X3)
arm extension (45lb 12X3)
back (?) (132lb 12X2)

Stretch 10 min

I stopped earlier because the spasm of lower back when I doing the weight training, not very severe, but still fearful.