How much missing is acceptable in training? 

1. Root cause of misses? 

• technique breakdown?
• Excessive fatigue?. 

1. Psychological effect of missing too often?

• Fear of failure?
• Negative self dialogue?
• Delusional self image

1. Being too conservative (no misses ever)

• Can be self limiting 
• Can lead to unrealistic expectations

Practical tips 

Keep accurate logs and record missed lifts. 

Establish an appropriate range of missed lifts Ratio of misses/makes.

Frame your thinking around success, but develop a strategy to deal with unexpected circumstances.