Exercise ball (English Wikipedia)

Vera-Garcia, FJ; Grenier, SG; McGill, SM (2000). "Abdominal muscle response during curl-ups on both stable and labile surfaces". Physical Therapy. 80 (6): 564–569. doi:10.1093/ptj/80.6.564. PMID 10842409. Archived from the original on September 27, 2007.
Clark, K. M.; Holt, L. E.; Sinyard, J. (2003). "Electromyographic comparison of the upper and lower rectus abdominis during abdominal exercises". The Journal of Strength and Conditioning Research. 17 (3): 475–483. doi:10.1519/1533-4287(2003)017<0475:ecotua>2.0.co;2. PMID 12930172. S2CID 23688868.
Anderson, Gregory S.; Gaetz, Michael; Holzmann, Matt; Twist, Peter (2013). "Comparison of EMG activity during stable and unstable push-up protocols". European Journal of Sport Science. 13 (1): 42–48. doi:10.1080/17461391.2011.577240. S2CID 145637535.
Gregory DE, Dunk NM, Callaghan JP (2006). "Stability ball versus office chair: comparison of muscle activation and lumbar spine posture during prolonged sitting". Hum Factors. 48 (1): 142–53. doi:10.1518/001872006776412243. PMID 16696264. S2CID 2050099.
McGill SM, Kavcic NS, Harvey E (May 2006). "Sitting on a chair or an exercise ball: various perspectives to guide decision making". Clin Biomech (Bristol, Avon). 21 (4): 353–60. doi:10.1016/j.clinbiomech.2005.11.006. PMID 16410033.

dumbbellsreview.com

Demoss, Daniel (April 2, 2021). "Dumbbell Chest Exercises You Can Do Without a Bench". dumbbellsreview.com. Retrieved April 20, 2021.

Vera-Garcia, FJ; Grenier, SG; McGill, SM (2000). "Abdominal muscle response during curl-ups on both stable and labile surfaces". Physical Therapy. 80 (6): 564–569. doi:10.1093/ptj/80.6.564. PMID 10842409. Archived from the original on September 27, 2007.
Clark, K. M.; Holt, L. E.; Sinyard, J. (2003). "Electromyographic comparison of the upper and lower rectus abdominis during abdominal exercises". The Journal of Strength and Conditioning Research. 17 (3): 475–483. doi:10.1519/1533-4287(2003)017<0475:ecotua>2.0.co;2. PMID 12930172. S2CID 23688868.
Gregory DE, Dunk NM, Callaghan JP (2006). "Stability ball versus office chair: comparison of muscle activation and lumbar spine posture during prolonged sitting". Hum Factors. 48 (1): 142–53. doi:10.1518/001872006776412243. PMID 16696264. S2CID 2050099.
McGill SM, Kavcic NS, Harvey E (May 2006). "Sitting on a chair or an exercise ball: various perspectives to guide decision making". Clin Biomech (Bristol, Avon). 21 (4): 353–60. doi:10.1016/j.clinbiomech.2005.11.006. PMID 16410033.

"Exercise ball home workout for runners". Canadian Running. July 20, 2020. Retrieved April 20, 2021.

Clark, K. M.; Holt, L. E.; Sinyard, J. (2003). "Electromyographic comparison of the upper and lower rectus abdominis during abdominal exercises". The Journal of Strength and Conditioning Research. 17 (3): 475–483. doi:10.1519/1533-4287(2003)017<0475:ecotua>2.0.co;2. PMID 12930172. S2CID 23688868.
Anderson, Gregory S.; Gaetz, Michael; Holzmann, Matt; Twist, Peter (2013). "Comparison of EMG activity during stable and unstable push-up protocols". European Journal of Sport Science. 13 (1): 42–48. doi:10.1080/17461391.2011.577240. S2CID 145637535.
Gregory DE, Dunk NM, Callaghan JP (2006). "Stability ball versus office chair: comparison of muscle activation and lumbar spine posture during prolonged sitting". Hum Factors. 48 (1): 142–53. doi:10.1518/001872006776412243. PMID 16696264. S2CID 2050099.

Anderson, Gregory S.; Gaetz, Michael; Holzmann, Matt; Twist, Peter (2013). "Comparison of EMG activity during stable and unstable push-up protocols". European Journal of Sport Science. 13 (1): 42–48. doi:10.1080/17461391.2011.577240. S2CID 145637535.

Gregory, Diane E. "The Use of Stability Balls in the Workplace in Place of the Standard Office Chair". Centre for Research Expertise for the Prevention of Muscloskeletal Disorders, University of Waterloo. Archived from the original on 31 March 2012. Retrieved 1 January 2011.

Vera-Garcia, FJ; Grenier, SG; McGill, SM (2000). "Abdominal muscle response during curl-ups on both stable and labile surfaces". Physical Therapy. 80 (6): 564–569. doi:10.1093/ptj/80.6.564. PMID 10842409. Archived from the original on September 27, 2007.
Gregory, Diane E. "The Use of Stability Balls in the Workplace in Place of the Standard Office Chair". Centre for Research Expertise for the Prevention of Muscloskeletal Disorders, University of Waterloo. Archived from the original on 31 March 2012. Retrieved 1 January 2011.