Run streaks are like the cardio version of single-exercise challenges. They basically encourage people to run every single day, racking up as many consecutive running days as humanly possible. There's even a freakin’ United States Running Streak Association where members have run daily for everything from just over a year to more than 46 years straight. The latter is about 17,000 days, if you want to take a moment to envision the hell of doing anything for that long.
Running isn’t the problem per se. Amanda Nyx, a former collegiate athlete and certified fitness instructor, says, “Many people don’t understand how to do it safely or at an appropriate level for themselves.” FYI, running for more than 17,000 days isn’t appropriate for most people (as you'll see from the fact that only one person has done it). Days off for recovery are important. If you want to set running goals, great. Just don’t aim to run every day for the foreseeable future.
Workouts that develop "long, lean" muscles
This trend gets a facelift every couple years, but the basic gist never changes: to get a "long, lean" body (or the latest marketing tool, the "dancer’s body"), you absolutely must lift super-light weights a million times.
Like running, these high-rep, low-weight workouts aren’t necessarily bad. Barre workouts, the Tracy Anderson Method, and even some cycling studios incorporate the tactic into their programs, but Jennifer McAmis, a fitness instructor and personal trainer, explains the problem is with the implication. If light weight-training means a long, toned body, heavy weight-training must mean a bulky body, right?
The type of body you achieve through training relies on many factors, including diet and whether your goal is to develop strength or build mass, and it tends to pigeonhole women into one style of training and men into another. Also, muscle length is fixed. You’re not going to get longer muscles by doing one form of training or another.