One training device is the ergometer. I never owned one, never trained on one, and practically never used one. The few national team tests I took on ergs were dismal failures, which worked wonders to further my dislike of these beastly creatures. Boring. Tedious. Noisy. Ergs have greatly cheapened rowing. Graceless. Greasy. Grim. The erg is to rowing what having sex by yourself is to having sex. Stop it!