Dopamine is the brains neurotransmitter that is responsible for motivation. it makes sense that your husband is lacking motivation. hes not being "lazy" hes either depressed or apathetic, both are just two very common symptoms in a whole lovely bouquet of "parkinsons Disease". and I would step out of the role of personal trainer. Then go for a walk. Come back full of good will and smiling, then tell him , tomorrow he can go with you, then tell him you love him, take him by the hand and walk with him as far as he would like to go. End with a treat for you both. (the best friends i have just pick me up and dont let me choose) but dont judge me either, of course, it should be his best time of the day...

Thanks for your reply. My husband is not able to ride a bicycle outside. We did have an exercise bike before he was diagnosed with PD - it was for me to lose weight but we got rid of it as we did not really have the room for it. Even if we had it now, my husband is not that motivated (despite my efforts to get him to go to various activities eg swimming, ballroom dancing, guitar lessons (we have a guitar). He does find walking more difficult of late and tires extremely easily. Sometimes I don't know if I should be 'pushing' him to try things as he doesn't seem interested - maybe he is not able to do any activities even if he was interested in an activity.
I will press on.
Our church is very supportive.
Chris.

Tellhim the discomfort wouldn't be as bad if he would exercise.that makes a world of difference.

I once was a big walker.. I walked 1000 GPS miles in 2014 I then had back sugery (laminectomy) which excellerated my Parkinson Diease big time. Can just walk around block now. Tell him as I tel MY SELF. Get off my fat rump and keep going. It sound like me at the start of pd. He need motivation.
Delton Shirley

Try starting with activities you know will be successful, such as a slow walk in the park or a trip to the museum, or what ever is his interest. The more he moves and finds a passion, the less apathy he will have.