Do it yourself QiSei.

They are actually ancient martial arts and Qigong tools.
Parts needed:
1. 4' hardwood dowel cut in half. It should be between 1 inch and 1.5" in diameter, depending on what is comfortable for your hands.
2. Two 1 pound coffee cans (if you have been really working out two and a half pound cans can be used).
3. 6 small wood screws.
4. Bag of ready mix concrete.

Poke a small hole in the center of each coffee can bottom. Use an ice pick or something else sharp to keep the hole small.
Poke another hole in the center of the end of each half of the dowel.
Screw three of the screws 1/2 way into the dowels, near the end with the hole. These will help keep the can from slipping.
Screw the last screw through the hole in the can into the hole in the end of the dowel.
Mix enough of the ready mix to fill both cans. Pour or spoon into the cans and let dry over night.

Each can & dowel should weigh about 5 to 6 pounds when solid. Hold the dowel at the end opposite the can and do various wrist and arm exercises.
You can also hold in both hands and do two handed sword exercises. If you can't hold the dowel at the end, move your grip closer to the can until you are stronger.

See www.JadePowerQigong.com and www.YuLiQigong.com for forms you can use with your QiSei.

Author's Bio: 

Jeff Smoley has been studying martial arts since 1960 and Qigong since 1976.
He holds black belts in two Jujitsu styles.
He is a lineage holder and master of Zhou Family Qigong and co-founder of YuLi (Jade Power) Qigong.

1960-1962 Kodokan Judo/Korean Yudo, gokyu; w/ Sensei Kim Young Chol (Queens, NY)
1962-1973 Furuya Ryu Kobujitsu (Jujitsu), nidan; w/ Sensei Kenichi Furuya & Sensei
Kenjiro Furuya (Queens, NY), with a gap from 1968 to 1971 due to service in the US Army.
1964-1973 Jujitsu & Shorinji Kempo, sandan in Jujutsu; w/ Sensei Arai, Long Island Jujutsu Academy (Queens, NY), with a gap from 1968 to 1971 due to service in the US Army.
1973-1982 Jujitsu & Hop Gar Gongfu & Qigong, yondan in Jujutsu; w/ Sensei Andy Garcia (Miami Beach, Fl.)
1993-1994 Jujitsu & Aikido, w/ Sensei Leoni Velasquez. (Hollywood, Fl.)
1996-1999 Chen Taijiquan; w/ Yan GaoFei under Chen QuanZhong. (Hollywood, Fl.), on and off due to work.

1999-2008 Qigong with Dr. Zhou Peigen
Additional Qigong training with GM Chen Quanzhong, GM Chen Zhenglei, Sifu Andy Garcia, Dr. Glenn Morris and Laosi Paul Chen.