Lena - if you are using a pedometer and counting all of your steps every day, yes, the 50 miles in May challenge may be too low for you. Alternately, just set your own goal. If you are getting 1.7 miles a day by your pedometer, aim for a higher step count. Eventually you want to be doing about 10,000 steps a day.
1.7 miles is probably around 3500-4000 steps. If that's what you are at right now, I would say a good goal for you would be to increase to 5000 steps a day. If you are at 5000, bump it up to 6000 steps a day.
Don't shoot for 10,000 straight off if you are at 4000 or so right now. You can increase by 1000 steps every couple of weeks. Some people increase by 10% of their average daily count, but this gets very "math-y" so you can just go up by 1000 steps every 2-3 weeks or so.
I am only counting actual walks towards my challenge. This makes it more difficult for me. Even though I've been getting 10,000 steps every day (except one), I still only count when I go out for my 1.4-2 mile walk that I do all at once. This is because my focus is on cardiovascular health this month.
This morning I did Zumba, and it came out to 2 miles for the hour. As much as I would like to count this, I'm not going to. I'll count my actual walk if I go for it this evening. However, those Zumba steps do count for my 10,000 steps a day goal.
So, really, you just have to use this challenge and adjust it to your own goals. We have some people who are aiming for 20-25 miles for the month, and others who are aiming for 75, many of which will be from running. Others are just aiming for 10,000 steps a day. I am aiming for 10,000 steps a day, with a total of 50 Miles coming from specific walks. It's all good.
Comfortable at this size/weight (I really don't want to buy size 0 jeans).
It's not about "weight" or the number on the scale. It's about lean muscle mass and body fat percentage.
At 125 I was a size 8 (after I lost 100+ pounds over 1.5 years).
At 135 I was a size 6 (maintained for several years) and over 28% body fat. I had 97 pounds of lean muscle mass and felt skinny fat.
Now at 140 I am a size 2 and have the smallest measurements I've ever had since I started taking them around the age of 18. I'm at 25% body fat and 107 pounds of lean muscle mass!! I'm no She-Hulk, either.
Don't tell me you aren't losing "weight." That doesn't tell me anything. Tell me how much fat you've lost and how much lean body mass you've gained. Here's a good start to estimate: http://www.scientificpsychic.com/fitness/diet.html