Seated Calf Raises, a exercise too strenghten your lower calfs. Grab a pair of Dumbbells and sit on the end
of a gym bench, or a chair at home. Put the balls of your feet on the edge of a step block or weighted plates and rest
the ends of the dumbbells on your thighs close to your knees. Let your heels drop as far as possible without hitting
the floor, and try to feel the tension as you stretch the calf muscles, and slowly raise your heels off the floor as far as
possible. Squeeze your calves and pause and then slowly lower your heels back to the starting position. Too build
calves you have too use a lot of reps because they are red fiber tendons and squeeze for a few seconds at the top of
the movement to add intensity. You can also do bodyweight barefoot calve raises standing to strengthen your feet and
toes by raising your calves off the floor and stand shoulder-width while exercising your calves for a large amount of reps.
Here is a good exercise calf machine that’s portable and good for calf exercises, link, Rogers Steward Extreme II calf machine