Fitness challenges can help you make exercising more of a habit. But experts warn that they're not for everyone.

What is the 75 Hard challenge?: The weight loss ... "It's hard not to see people who look like you who want to mirror you in ...

The 75 Hard challenge is marketed as a mental toughness ... completing the day before and seeing the results of energy and motivation. Let me be clear, though: Every day was not filled with ...

Unlike 75 Hard, this trend does not require you to ... You can reflect on your journal the further along you go, which "can be super motivational if you've managed to stick to your challenges ...

Created by entrepreneur Andy Frisella, 75 Hard is not presented as the average ... like you who want to mirror you in terms of success, motivation, or discipline." Walls also posted his results ...

Considering a new fitness challenge? Experts say there are benefits — but it's not for everyone. (Getty Creative) ...