I like that feeling, too. Triceps are sort of hard to isolate without working on other muscles or muscle groups. For me, they respond well to exercise, meaning you can see results faster than in other muscles (say, quads). However, it often hurts more.
It does feel good. But when I started that, my arms still felt like noodles three days later and then not so much. If you're not doing it already, I recommend a good stretch (http://adam.about.com/encyclopedia/Triceps-stretch.htm) before and after the routine to help with the "recovery" phase.
Yes, my triceps are wimpy, too. I think they don't get all that much use in day-to-day life. We're always using the biceps instead for the heavy lifting.
Actually, the triceps are the largest muscle in the arm. My problem is getting them *out* of my chest workouts. They're always taking over if I don't concentrate on getting proper form (bench presses are actually done by *pulling* with your pectorals, not *pushing* with your triceps). Consequently, my triceps are huge, and my pecs require good lighting ;-)
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It's where I'm sure to ache the worst when I increase distance or decrease time in my swim routine.
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