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http://journals.lww.com/acsm-healthfitness/Fulltext/2013/05000/HIGH_INTENSITY_CIRCUIT_TRAINING_USING_BODY_WEIGHT_.5.aspx http://journals.lww.com/acsm-healthfitn

http://journals.lww.com/acsm-healthfitness/Fulltext/2013/05000/HIGH_INTENSITY_CIRCUIT_TRAINING_USING_BODY_WEIGHT_.5.aspx http://journals.lww.com/acsm-healthfitness/Fulltext/2013/050... But honestly, if you think 20 seconds of pushups, lunges, and running place are "dangerous" I'm not sure what to say (seems like we all survived gym class just fine). Just go at a reasonable pace, and if you get exhausted, or if something hurts, take a break.

sukuriant 13y ago
Sudden, intense motion at regular, yet infrequent intervals and without any preparation between them seems like a great way to tear a ligament or tendon to this uneducated person. Of course, I'm always thinking about the wonderful injuries that I can get being a weekend warrior, and that's going at it super hard at infrequent (yet regular) intervals.
- throwawaymsft 13y ago
  Sure, for weightlifting, maybe -- but bodyweight exercises like squats and pushups? About the same chance as tearing something when picking up a phone you dropped on the floor. Like anything, just go at a reasonable pace. (I'm not a fitness expert, but exercises like this were the warmup in whatever class I would be in, no "preparation" to do a pushup or squat.)
  - sukuriant 13y ago
    You're not weightlifting when you tear an ACL skiing or snowboarding. It just seems like a poor idea.