for quads: stand about a foot a way from the wall with your back to it and bend down so your back is pressed against the wall but your knees are bent and form a right angle, so your calfs and thighs are perpendicular to each other. try to stay in this position for a minute, do that every day and slowly add another minute...i did that for a while and can now stay in that position for 18 minutes! so it really does work
for quads, biking also REALLY strengthens them, same with squats and lunges
for hamstrings (back of your thigh) the best things to do for them is skipping and jumping while you run, jumprope, and lots of running up and down stairs. it's harder to tone back of your legs so just stay active [ peebles7's advice column | Ask peebles7 A Question ]
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