Go to bedok, new system, all electronic, cannot cheat on sit-up.
Last time buddy buddy, count "10, 11, 12, 14, 15, 16, 18.." Now
cannot. using sensor everytime you come up (he! he! no need for
elbow to touch knee also can). Pull up easier if cannot go all the
way pass certain point above bar counted (get a 'taller' hair-do
lor).
Maju dun have such system leh! 
Hi,
thanks for the advice. But how does duck walk improves SBJ? My
worrant officer told me the same thing, but can't understand the
logic behind it.
You need to improve your leg muscles first, there some exe you
could do.
First the upper leg, I think it is called the half squat:
1) Legs shoulder length apart, arms at your side.
2) Bend both your knees and try to reach the ankles by both your
hands at the side. Your body should remain in upright position as
much as possible.
3) Resume back to starting position.
This good good for your upper leg muscle.
The next will be the lower leg muscle,
1) Legs shoulder length apart, arms at your side.
2) Stand at your toes by lifting your heel off the ground.
After doing the above two exe for every day for a week or so,(20-30
counts), you need to train all your "spring" power.
1) Assume SBJ position or swimmer's diving position.
2) Jump up as high as possible.
As I said, the exe 1 & 2 will help to build up your leg muscles
for the first week then from 2nd week all three exe (all at least
20-30 counts), afterwhich you start doing the standard SBJ and see
whether any improvement.
Word of caution , make sure you do sufficient stretching exe b4 you
start and warm down stretching after them , and rest a a day or so
if you feel uncomfortable. Remember stretching exe is very
important for such exe!!