Are there any cardio exercises for seniors that mainly use the arms and do not involve walking, biking, using a treadmill, or swimming?
Get yourself some lightweight dumbbells from Craigslist, or use empty gallons of milk jugs, fill them with water to create your own “weights.” Do presses and curls with your weights.
Presses mean standing up with the weights at your shoulders and pushing them straight up until your arms are straight overhead.
Curls mean standing with your arms hanging straight down and flexing your arm until the weights are at your chest.
Do one movement (press) until your shoulders and triceps (back of the arms) begin to feel tired, then do the other movement (curls) until your biceps (the muscle on the front of your upper arm) feels tired. Rest for three minutes; Then start again. Adjust the weight to feel tired somewhere around 8–12 repetitions of each exercise. You can do these two or three times each week and notice enhanced muscle tone in your upper arms in about a month.