This exercise is aiming to strengthen the wrist flexors muscles on the front of your forearm.
Have your forearm resting on a table to help offer support with your palm facing upwards. Holding a dumbbell or a bottle water for weight and with your hand off the edge of the table, whilst keeping your forearm in contact with the table, lift your hand upwards. Then slowly return back to the start position. You should aim to go through the full range of movement starting in a slightly extended position and finishing in a fully flexed position.
To make this exercise harder perform the repetition slower, increase the weight or increase the repetitions.
Follow the advice in your rehab programme for the suggested number of reps or duration you need to perform.
EQUIPMENT 
Dumb Bells: https://www.thephysiobot.com/dumb-bells/
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FOR PHYSIOS
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Check out our free "Exercise Programme Creator" tool, where you build your own exercise programme, setting reps and sets for each, with links to videos embedded. It's easy to download as a PDF and send on to your clients.
https://www.thephysiobot.com/build-a-programme/
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PATREON
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