These 2 exercises are designed for people with quite severe lateral elbow pain that have difficulty gripping/lifting even light objects.
1) Isometric Wrist Extension with 1kg dumbbell.
Start with 3x10sec holds. If pain-free, progress to 3x30sec holds or increase the weight. If you can tolerate doing this every day for 1 week, progress to exercise no.2
2) Eccentric Wrist Extension
Do 3 sets of 15 reps with 1kg. If pain-free, add an extra 1kg. Complete this exercise every second day.

B.Sp.Ex.Sc.,M.Physio.,Cert.Spinal.Man.Tpy., APAM
Andrew Clark is a father of 3 and the owner and principal physiotherapist at Clinical Physiotherapy, St Ives. He graduated with a Masters degree from the University of Sydney in 2010 and has since had 10 years experience working in musculoskeletal private practice. He has undergone extensive professional development and has experience treating a wide variety of patients and musculoskeletal conditions.