Little is known about the relationship between attitudes and characteristics of instructors and uptake and adherence of older people to exercise classes. This article explores these issues. Methods: The authors surveyed 731 UK exercise instructors with specialist older adult exercise qualifications. A questionnaire investigated instructors’ characteristics and attitudes toward older adults’ participation in exercise. Results: For mostly seated classes, EXTEND qualification (B = 0.36, p = .005) had a positive effect on instructors’ attitudes. Later Life Training qualification (B = –2.80, p = .003), clinical background (B = –3.99, p = .005), and delivering classes in National Health Services (B = –3.12, p qqqlt; .001), leisure centers (B = –2.75, p = .002), or nursing homes (B = –2.29, p = .005) had a negative effect on attitudes. For mostly standing classes, experience (B = 0.20, p = .003) and delivering in leisure centers (B = 0.46, p = .032) had a positive and clinical background (B = –1.78, p = .018) had a negative effect on instructors’ attitudes. Conclusions: Most instructors have positive attitudes, but training and work context can influence attitudes toward older people’s participation in exercise classes both positively and negatively.