Hi ladies and gents.

I'm a more frequent lurker on the exercise forum than poster, but after becoming very bored with my gym routine (and it is just that, a routine... I need something challenging every 4-6 weeks!) I thought about doing a circuit, specifically, designing my own circuit. I need a few thoughts and opinions about what I've done. I'm following an arm-leg-trunk approach and trying to fit in the major muscle groups.

Circuit 1. Each exercise is 20 seconds long with 2 minutes of cardio in between and a 1 minute rest between circuits.
- pushups (cardio) lunges (cardio) side bends (cardio) + 1 min rest
- bicep curls (cardio) calf raises (cardio) half-sits (cardio) + 1 min rest
- kickbacks (cardio) alternating squat thrust (cardio) supermans (cardio) + 1 min rest
- shoulder press (cardio) burpees (cardio) alternating V sits (cardio) + 1 min rest
- Nieder press (cardio) tuck jumps (cardio) crunchies (cardio) + 1 min rest

Each circuit is 8 minutes long (including the rest) with a 5 minute warmup and 5 minute cooldown for a total of 50 minutes.

Circuit 2. Each exercise is 30 seconds long with 3 minutes of cardio in between and a 1 minute rest between circuits
- dips (cardio) squats (cardio) half-sits with twist (cardio) + 1 min rest
- alternating shoulder press (cardio) alternating squat thrust (cardio) situps (cardio) + 1 min rest
- pressups (cardio) tuck jumps (cardio) alternating dorsal raises (cardio) + 1 min rest
- bicep curls (cardio) *******s (cardio) trunk curls (cardio) + 1 min rest

Each circuit is 11.5 minutes long including rests with 5 minute warmup and 5 minute cooldown for a total of 56 minutes.

Circuit 3. Each exercise is 20 seconds long with 2 minutes of cardio in between and 1 minute rest between circuits
- arm circles (cardio) calf raise (cardio) half-sits (cardio) + 1 min rest
- tricep press (cardio) split jump (cardio) supermans (cardio) + 1 min rest
- lateral raise (cardio) star jump (cardio) situps (cardio) + 1 min rest
- neck press (cardio) box jump (cardio) flutterkicks (cardio) + 1 min rest

Each circuit is 8 minutes long including rests with 5 minute warmup and 5 minute cooldown for a total of 42 minutes.

I'll be alternating them, so M/W/F is circuit day with Su/T/Th as running days (Saturday is my rest day), but I'm not doing 1 on Monday, 2 on Wednesday and 3 on Friday- I'm mixing them up.