But the deeper theory behind this piece of equipment is that the extra weight engages the bigger, stabilizing muscles in the back and shoulders so the more jumpy parts of the body (wrists and hands) are minimized in the putting stroke.
After Sept. 11, 2001, many Americans became more patriotic, and many became more jumpy.
The whole of the country was jittery after the strikes and the intelligence services were more jumpy than anyone.
Yet the evening is more jumpy than edgy.
I'm not a very bad-tempered person, but I do feel more jumpy than usual.
The ambushes are more frequent, the Iraqi soldiers more desperate, the Americans more jumpy.
"I was a little more jumpy from the right side," Beltran said, adding, "From the left side, I feel like I was a little more patient".
But the police seem a little more jumpy than unusual, cars are being towed by bomb disposal experts, office workers are regularly moved out of buildings by bomb scares, gathering in courtyards or the street to chat, smoke and wait.
His first ball, from Stuart Broad, who had started to bowl really well and had taken the two wickets to fall, was a near-wide down the leg side (four byes) – perhaps the bowler was more jumpy than the batsman.
Travellers know only too well, though, what effect this news will have on their flying experiences in the immediate future: everyone becomes that little bit more jumpy; security procedures become that little bit more intrusive.
The batting about of the "R" word -- recession -- is making investors even more jumpy because that could turn the slower growth in profits that many investors are now expecting into a decline in profits.
